Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001280058 (http://www.sec.gov/CIK)

Income Tax Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense	The following summarizes the components of income tax expense:    Years ended December 31,   (dollars in thousands) 2016 2015 2014 Current taxes:       U.S. Federal $ 4,655 $ 5,890 $ 5,757 U.S. State and local 1,670 2,215 2,158 International 53 33 (21 ) Total current taxes 6,378 8,138 7,894 Deferred taxes:       U.S. Federal 2,544 2,702 4,725 U.S. State and local 304 585 (1,329 ) International 185 (122 ) (346 ) Total deferred taxes 3,033 3,165 3,050 Total income tax provision $ 9,411 $ 11,303 $ 10,944
Schedule of Income Before Provision for Income Taxes	The following summarizes the components of income before provision for income taxes:    Years ended December 31,   (dollars in thousands) 2016 2015 2014 U.S. $ 49,320 $ 37,523 $ 39,638 International 1,606 (571 ) (404 ) Income before provision for income taxes $ 50,926 $ 36,952 $ 39,234
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate our income tax provision is as follows:    Years ended December 31,      2016 2015 2014 Federal statutory rate 35.0  % 35.0  % 35.0  % Effect of:       State income taxes, net of federal benefit 4.1 5.7 3.2 Change in state income tax rate applied to deferred tax balances 0.2 2.1 (1.1 ) Fixed assets — (0.1 ) (0.3 ) Unrecognized tax benefit 0.2 (1.1 ) (2.9 ) State credits, net of federal benefit (0.1 ) 6.0 (1.0 ) Change in valuation reserve (primarily state credit reserves) (1.6 ) (8.6 ) 1.3 Federal credits generated (6.2 ) (6.1 ) (4.7 ) Foreign tax rate (0.4 ) (0.7 ) (0.1 ) Acquisition costs 0.1 0.1 0.6 Section 162(m) limitation 1.7 0.1 0.4 Loss from sale of foreign subsidiary — 1.9 — Domestic production activities deduction (1.2 ) (1.8 ) (1.2 ) Stock-based compensation (13.6 ) — — Other 0.3 (1.9 ) (1.3 ) Income tax provision effective rate 18.5  % 30.6  % 27.9  %
Schedule of Deferred Tax Assets and Liabilities	The significant components of our deferred tax assets and liabilities were as follows:    December 31,   (dollars in thousands) 2016 2015 Deferred tax assets relating to:     Federal and state and foreign net operating loss carryforwards $ 12,906 $ 13,913 Federal, state and foreign tax credits 9,924 10,464 Intangible assets 652 449 Stock-based compensation 11,480 7,848 Accrued bonuses 7,426 9,335 Deferred revenue 5,371 6,049 Allowance for doubtful accounts 1,294 780 Other 6,781 6,593 Total deferred tax assets 55,834 55,431 Deferred tax liabilities relating to:     Intangible assets (44,885 ) (49,559 ) Fixed assets (9,200 ) (10,323 ) Other (21,934 ) (12,765 ) Total deferred tax liabilities (76,019 ) (72,647 ) Valuation allowance (6,994 ) (7,911 ) Net deferred tax liability $ (27,179 ) $ (25,127 )
Summary of Changes in Deferred Tax Asset Valuation Allowance	The following table illustrates the change in our deferred tax asset valuation allowance:  Years ended December 31, Balance at beginning of year Acquisition related change Charges to expense Balance at end of year (dollars in thousands) 2016 $ 7,911 $ — $ (917 ) $ 6,994 2015 11,161 — (3,250 ) 7,911 2014 11,042 — 119 11,161
Summary of Changes in Unrecognized Tax Benefits	The following table sets forth the change to our unrecognized tax benefit for the years ended December 31, 2016, 2015 and 2014:    Years ended December 31,   (dollars in thousands) 2016 2015 2014 Balance at December 31, 2015 $ 3,024 $ 3,564 $ 3,698 Increases from prior period positions 23 129 195 Decreases in prior year positions (17 ) (651 ) (102 ) Increases from current period positions 358 257 1,046 Settlements (payments) — (274 ) — Lapse of statute of limitations (243 ) (1 ) (1,273 ) Balance at December 31, 2016 $ 3,145 $ 3,024 $ 3,564