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100270 - Disclosure - Nature of Business and Summary of Significant Accounting Policies (Tables)
(http://www.adtran.com/20161231/taxonomy/role/DisclosureNatureOfBusinessAndSummaryOfSignificantAccountingPoliciesTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Organization Consolidation And Presentation Of Financial Statements [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Organization Consolidation And Presentation Of Financial Statements [Abstract]
 
Summary of Warranty Expense and Write-Off Activity

A summary of warranty expense and write-off activity for the years ended December 31, 2016, 2015 and 2014 is as follows:

 

Year Ended December 31,

 

2016

 

 

2015

 

 

2014

 

(In thousands)

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

 

$

8,739

 

 

$

8,415

 

 

$

8,977

 

Plus: Amounts charged to cost and expenses

 

 

8,561

 

 

 

2,998

 

 

 

3,103

 

Less: Deductions

 

 

(8,752

)

 

 

(2,674

)

 

 

(3,665

)

Balance at end of period

 

$

8,548

 

 

$

8,739

 

 

$

8,415

 

 

 
 
Changes in Accumulated Other Comprehensive Income, Net of Tax by Component

The following table presents changes in accumulated other comprehensive income, net of tax, by component for the years ended December 31, 2014, 2015 and 2016:

 

(In thousands)

 

Unrealized

Gains (Losses)

on Available-

for-Sale

Securities

 

 

Defined

Benefit Plan

Adjustments

 

 

Foreign

Currency

Adjustments

 

 

Total

 

Balance at December 31, 2013

 

$

10,737

 

 

$

(891

)

 

$

907

 

 

$

10,753

 

Other comprehensive income (loss) before

   reclassifications

 

 

2,363

 

 

 

(4,866

)

 

 

(4,189

)

 

 

(6,692

)

Amounts reclassified from accumulated other

   comprehensive income

 

 

(4,136

)

 

 

 

 

 

 

 

 

(4,136

)

Balance at December 31, 2014

 

 

8,964

 

 

 

(5,757

)

 

 

(3,282

)

 

 

(75

)

Other comprehensive income (loss) before

   reclassifications

 

 

(844

)

 

 

1,589

 

 

 

(3,724

)

 

 

(2,979

)

Amounts reclassified from accumulated other

   comprehensive income

 

 

(6,188

)

 

 

273

 

 

 

 

 

 

(5,915

)

Balance at December 31, 2015

 

 

1,932

 

 

 

(3,895

)

 

 

(7,006

)

 

 

(8,969

)

Other comprehensive income (loss) before

   reclassifications

 

 

1,515

 

 

 

(1,229

)

 

 

(569

)

 

 

(283

)

Amounts reclassified from accumulated other

   comprehensive income

 

 

(3,043

)

 

 

107

 

 

 

 

 

 

(2,936

)

Balance at December 31, 2016

 

$

404

 

 

$

(5,017

)

 

$

(7,575

)

 

$

(12,188

)

 

 
 
Reclassifications Out of Accumulated Other Comprehensive Income

The following tables present the details of reclassifications out of accumulated other comprehensive income for the years ended December 31, 2016, 2015 and 2014:

 

(In thousands)

 

2016

Details about Accumulated Other Comprehensive

Income Components

 

Amount Reclassified

from Accumulated Other

Comprehensive Income

 

 

Affected Line Item in the

Statement Where Net Income

Is Presented

Unrealized gains (losses) on available-for-sale securities:

 

 

 

 

 

 

Net realized gain on sales of securities

 

$

5,408

 

 

Net realized investment gain

Impairment expense

 

 

(419

)

 

Net realized investment gain

Defined benefit plan adjustments – actuarial losses

 

 

(156

)

 

(1)

Total reclassifications for the period, before tax

 

 

4,833

 

 

 

Tax (expense) benefit

 

 

(1,897

)

 

 

Total reclassifications for the period, net of tax

 

$

2,936

 

 

 

 

(1)

Included in the computation of net periodic pension cost. See Note 11 of Notes to Consolidated Financial Statements.

 

(In thousands)

 

2015

Details about Accumulated Other Comprehensive

Income Components

 

Amount Reclassified

from Accumulated Other

Comprehensive Income

 

 

Affected Line Item in the

Statement Where Net Income

Is Presented

Unrealized gains (losses) on available-for-sale securities:

 

 

 

 

 

 

Net realized gain on sales of securities

 

$

10,348

 

 

Net realized investment gain

Impairment expense

 

 

(203

)

 

Net realized investment gain

Defined benefit plan adjustments – actuarial losses

 

 

(396

)

 

(1)

Total reclassifications for the period, before tax

 

 

9,749

 

 

 

Tax (expense) benefit

 

 

(3,834

)

 

 

Total reclassifications for the period, net of tax

 

$

5,915

 

 

 

 

(1)

Included in the computation of net periodic pension cost. See Note 11 of Notes to Consolidated Financial Statements.

 

(In thousands)

 

2014

Details about Accumulated Other Comprehensive

Income Components

 

Amount Reclassified

from Accumulated Other

Comprehensive Income

 

 

Affected Line Item in the

Statement Where Net Income

Is Presented

Unrealized gains (losses) on available-for-sale securities:

 

 

 

 

 

 

Net realized gain on sales of securities

 

$

6,895

 

 

Net realized investment gain

Impairment expense

 

 

(115

)

 

Net realized investment gain

Total reclassifications for the period, before tax

 

 

6,780

 

 

 

Tax (expense) benefit

 

 

(2,644

)

 

 

Total reclassifications for the period, net of tax

 

$

4,136

 

 

 

 

 
 
Other Comprehensive Income

The following tables present the tax effects related to the change in each component of other comprehensive income for the years ended December 31, 2016, 2015 and 2014:

 

 

 

2016

 

(In thousands)

 

Before-Tax

Amount

 

 

Tax

(Expense)

Benefit

 

 

Net-of-Tax

Amount

 

Unrealized gains (losses) on available-for-sale securities

 

$

2,484

 

 

$

(969

)

 

$

1,515

 

Reclassification adjustment for amounts related to available-for-sale investments included in net income

 

 

(4,989

)

 

 

1,946

 

 

 

(3,043

)

Defined benefit plan adjustments

 

 

(1,782

)

 

 

553

 

 

 

(1,229

)

Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income

 

 

156

 

 

 

(49

)

 

 

107

 

Foreign currency translation adjustment

 

 

(569

)

 

 

 

 

 

(569

)

Total Other Comprehensive Income (Loss)

 

$

(4,700

)

 

$

1,481

 

 

$

(3,219

)

 

 

 

2015

 

(In thousands)

 

Before-Tax

Amount

 

 

Tax

(Expense)

Benefit

 

 

Net-of-Tax

Amount

 

Unrealized gains (losses) on available-for-sale securities

 

$

(1,384

)

 

$

540

 

 

$

(844

)

Reclassification adjustment for amounts related to available-

   for-sale investments included in net income

 

 

(10,145

)

 

 

3,957

 

 

 

(6,188

)

Defined benefit plan adjustments

 

 

2,303

 

 

 

(714

)

 

 

1,589

 

Reclassification adjustment for amounts related to defined

   benefit plan adjustments included in net income

 

 

396

 

 

 

(123

)

 

 

273

 

Foreign currency translation adjustment

 

 

(3,724

)

 

 

 

 

 

(3,724

)

Total Other Comprehensive Income (Loss)

 

$

(12,554

)

 

$

3,660

 

 

$

(8,894

)

 

 

 

2014

 

(In thousands)

 

Before-Tax

Amount

 

 

Tax

(Expense)

Benefit

 

 

Net-of-Tax

Amount

 

Unrealized gains (losses) on available-for-sale securities

 

$

3,874

 

 

$

(1,511

)

 

$

2,363

 

Reclassification adjustment for amounts related to available-

   for-sale investments included in net income

 

 

(6,780

)

 

 

2,644

 

 

 

(4,136

)

Defined benefit plan adjustments

 

 

(7,052

)

 

 

2,186

 

 

 

(4,866

)

Foreign currency translation adjustment

 

 

(4,189

)

 

 

 

 

 

(4,189

)

Total Other Comprehensive Income (Loss)

 

$

(14,147

)

 

$

3,319

 

 

$

(10,828

)

 

 
 
Summary of Dividends Paid Per Common Share

The following table shows dividends paid to our shareholders in each quarter of 2016, 2015 and 2014.

 

Dividends per Common Share

 

 

 

2016

 

 

2015

 

 

2014

 

First Quarter

 

$

0.09

 

 

$

0.09

 

 

$

0.09

 

Second Quarter

 

$

0.09

 

 

$

0.09

 

 

$

0.09

 

Third Quarter

 

$

0.09

 

 

$

0.09

 

 

$

0.09

 

Fourth Quarter

 

$

0.09

 

 

$

0.09

 

 

$

0.09