| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2015-01-01 - 2015-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Schedule of Changes in the Plans' Benefit Obligations | The following table provides a reconciliation of the changes in the plans’ benefit obligations for the years ended December 31, 2015, and 2014: | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | (In thousands) | 2015 | 2014 | | 2015 | 2014 | Change in benefit obligation: | | | | | | Benefit obligation at beginning of year | $ | 621,823 |
| $ | 488,229 |
| | $ | 26,384 |
| $ | 24,747 |
| Merger transactions | — |
| 146,403 |
| | — |
| — |
| Service cost | — |
| 170 |
| | 61 |
| 81 |
| Interest cost | 22,581 |
| 22,324 |
| | 829 |
| 1,076 |
| Participant contributions | — |
| — |
| | 103 |
| 180 |
| Plan settlements | — |
| (70,612 | ) | | — |
| — |
| Actuarial loss (gain) | (38,859 | ) | 61,484 |
| | (3,600 | ) | 2,077 |
| Benefit payments | (41,911 | ) | (26,175 | ) | | (1,938 | ) | (1,777 | ) | Benefit obligation at end of year | $ | 563,634 |
| $ | 621,823 |
| | $ | 21,839 |
| $ | 26,384 |
|
|
Schedule of Assumptions Used to Determine the Plans' Benefit Obligations and Net Periodic Costs | The Plans’ benefit obligations were determined using the following assumptions: | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2015 | 2014 | | 2015 | 2014 | Discount rate | 4.03% to 4.21% |
| 3.80 | % | | 3.81% to 4.14% |
| 3.65 | % | Compensation increase rate | — |
| — |
| | 3.00 | % | 3.00 | % |
The net periodic costs for the Company’s pension and other benefit plans were determined using the following assumptions: | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2015 | 2014 | 2013 | | 2015 | 2014 | 2013 | Discount rate | 3.80 | % | 4.65 | % | 4.62 | % | | 3.65 | % | 4.40 | % | 4.35 | % | Expected return on plan assets | 7.50 | % | 7.50 | % | 7.50 | % | | — |
| — |
| — |
| Compensation increase rate | — |
| — |
| — |
| | 3.00 | % | 3.00 | % | 3.00 | % |
|
Schedule of Changes in Fair Value of the Plans' Assets | The following table provides a reconciliation of the changes in the fair value of the Plans’ assets for the years ended December 31, 2015, and 2014: | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | (In thousands) | 2015 | 2014 | | 2015 | 2014 | Change in plan assets: | | | | | | Fair value of plan assets at beginning of year | $ | 437,586 |
| $ | 352,226 |
| | $ | — |
| $ | — |
| Merger transactions | — |
| 115,556 |
| | — |
| — |
| Actual return on plan assets | (4,946 | ) | 16,712 |
| | — |
| — |
| Plan settlements | — |
| (70,612 | ) | | — |
| — |
| Employer contributions | 5,499 |
| 49,879 |
| | 1,835 |
| 1,597 |
| Participant contributions | — |
| — |
| | 103 |
| 180 |
| Benefit payments | (41,911 | ) | (26,175 | ) | | (1,938 | ) | (1,777 | ) | Fair value of plan assets at end of year | $ | 396,228 |
| $ | 437,586 |
| | $ | — |
| $ | — |
|
|
Schedule of Fair Value and Allocation of Plan Assets | The following table provides the fair value by each major category of plan assets at December 31, 2015 and 2014:
| | | | | | | | (In thousands) | 2015 | 2014 | Level 1: | | | U.S. Small/Mid Cap Equity | $ | 19,672 |
| $ | 22,343 |
| U.S. Large Cap Equity | 110,254 |
| 121,046 |
| International/Global Equity | 43,072 |
| 50,037 |
| Fixed Income | 109,909 |
| 120,522 |
| REIT | — |
| — |
| Cash | 4,021 |
| 8,904 |
| Total Level 1 | $ | 286,928 |
| $ | 322,852 |
| Investments measured at NAV: | |
| Equity Common Collective Trusts | 56,054 |
| 62,853 |
| Fixed Income Common Collective Trusts | 48,710 |
| 46,689 |
| Real Estate and Real Assets Common Collective Trusts | 4,536 |
| 5,192 |
| Total Investments Measured at NAV | $ | 109,300 |
| $ | 114,734 |
| Total Assets | $ | 396,228 |
| $ | 437,586 |
|
The asset allocation for the Company’s funded retirement plans at the end of 2015 and 2014, and the asset allocation range for 2016, by asset category, are as follows: | | | | | | | | | Asset allocation Range | Percentage of Plan Assets at Year End | Asset Category | 2016 | 2015 | 2014 | Equity securities | 60 | % | 58 | % | 59 | % | Fixed income securities/cash | 40 | % | 41 | % | 40 | % | Other | |
| 1 | % | 1 | % | Total | |
| 100 | % | 100 | % |
|
Schedule of Net Funded Status | The following table provides a statement of the funded status of the plans at December 31, 2015, and 2014: | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | (In thousands) | 2015 | 2014 | | 2015 | 2014 | Amounts recorded in the balance sheet: | | | | | | Current liabilities | $ | (4,169 | ) | $ | (4,175 | ) | | $ | (2,089 | ) | $ | (2,148 | ) | Noncurrent liabilities | (163,237 | ) | (180,062 | ) | | (19,750 | ) | (24,236 | ) | Funded Status | $ | (167,406 | ) | $ | (184,237 | ) | | $ | (21,839 | ) | $ | (26,384 | ) |
|
Summary of the Company's Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Benefits | The following table provides a summary of the Company’s accumulated other comprehensive income (loss) related to pension and other benefits prior to any deferred tax effects: | | | | | | | | | | Pension Benefits | | Other Benefits | (In thousands) | Net Actuarial Gain/(Loss) | | Net Actuarial Gain/(Loss) | December 31, 2012 | $ | (1,668 | ) | | $ | — |
| Actuarial gain | 10,389 |
| | 174 |
| December 31, 2013 | $ | 8,721 |
| | $ | 174 |
| Actuarial loss | (64,103 | ) | | (2,077 | ) | December 31, 2014 | $ | (55,382 | ) | | $ | (1,903 | ) | Actuarial gain | 4,621 |
| | 3,584 |
| December 31, 2015 | $ | (50,761 | ) | | $ | 1,681 |
|
|
Schedule of Expected Plan Contributions | The following table includes amounts that are expected to be contributed to the plans by the Company. It additionally reflects benefit payments that are made from the plans’ assets as well as those made directly from the Company’s assets, and it includes the participants’ share of the costs, which is funded by participant contributions. The amounts in the table are actuarially determined and reflect the Company’s best estimate given its current knowledge including the impact of recent pension funding relief legislation; actual amounts could be materially different. | | | | | | | | (In thousands) | Pension Benefits | Other Benefits | Employer Contributions | | | 2016 to participant benefits | $ | 4,169 |
| $ | 2,090 |
| Expected Benefit Payments | | | 2016 | 34,162 |
| 2,090 |
| 2017 | 34,080 |
| 2,036 |
| 2018 | 34,052 |
| 1,958 |
| 2019 | 34,922 |
| 1,925 |
| 2020 | 34,622 |
| 1,867 |
| 2021-2025 | 175,254 |
| 8,600 |
|
|
Schedule of Net Periodic Benefit Costs | The following table provides the components of net periodic benefit cost for the Plans for fiscal years 2015, 2014 and 2013: | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | (In thousands) | 2015 | 2014 | 2013 | | 2015 | 2014 | 2013 | Service cost | $ | — |
| $ | 170 |
| $ | 170 |
| | $ | 61 |
| $ | 81 |
| $ | 11 |
| Interest cost | 22,581 |
| 28,147 |
| 3,312 |
| | 829 |
| 1,076 |
| 134 |
| Expected return on plan assets | (30,100 | ) | (33,973 | ) | (3,509 | ) | | — |
| — |
| — |
| Settlement loss recognized | — |
| 7,744 |
| — |
| | — |
| — |
| — |
| Amortization of net loss | 808 |
| 1,098 |
| 35 |
| | (28 | ) | — |
| — |
| Net periodic benefit cost (benefit) | $ | (6,711 | ) | $ | 3,186 |
| $ | 8 |
| | $ | 862 |
| $ | 1,157 |
| $ | 145 |
|
|