| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Change in the projected benefit obligation, plan assets at fair value and funded status | The change in the Company's postretirement benefit obligation is as follows: | | | | | | | | | | | | | | Year Ended December 31, | (In thousands) | 2016 | | 2015 | | 2014 | Change in Benefit Obligation | |
| | |
| | |
| Benefit obligation at beginning of year | $ | 36,626 |
| | $ | 37,076 |
| | $ | 34,995 |
| Service cost | 2,323 |
| | 1,808 |
| | 1,295 |
| Interest cost | 1,498 |
| | 1,448 |
| | 1,343 |
| Actuarial (gain) loss | (2,846 | ) | | (2,829 | ) | | 373 |
| Benefits paid | (934 | ) | | (877 | ) | | (930 | ) | Plan amendments | 815 |
| | — |
| | — |
| Benefit obligation at end of year | $ | 37,482 |
| | $ | 36,626 |
| | $ | 37,076 |
| Change in Plan Assets | |
| | |
| | |
| Fair value of plan assets at end of year | — |
| | — |
| | — |
| Funded status at end of year | $ | (37,482 | ) | | $ | (36,626 | ) | | $ | (37,076 | ) |
|
Schedule of amounts recognized in the balance sheet | Amounts recognized in the balance sheet consist of the following: | | | | | | | | | | | | | | December 31, | (In thousands) | 2016 | | 2015 | | 2014 | Current liabilities | $ | 1,223 |
| | $ | 1,333 |
| | $ | 1,249 |
| Long-term liabilities | 36,259 |
| | 35,293 |
| | 35,827 |
| | $ | 37,482 |
| | $ | 36,626 |
| | $ | 37,076 |
|
|
Schedule of amounts recognized in accumulated other comprehensive income | Amounts recognized in accumulated other comprehensive income (loss) consist of the following: | | | | | | | | | | | | | | December 31, | (In thousands) | 2016 | | 2015 | | 2014 | Net actuarial (gain) loss | $ | (2,266 | ) | | $ | 580 |
| | $ | 3,408 |
| Prior service cost | 704 |
| | — |
| | — |
| | $ | (1,562 | ) | | $ | 580 |
| | $ | 3,408 |
|
Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) | | | | | | | | | | | | | | Year Ended December 31, | (In thousands) | 2016 | | 2015 | | 2014 | Components of Net Periodic Postretirement Benefit Cost | |
| | |
| | |
| Service cost | $ | 2,323 |
| | $ | 1,808 |
| | $ | 1,295 |
| Interest cost | 1,498 |
| | 1,448 |
| | 1,343 |
| Amortization of prior service cost | 111 |
| | — |
| | — |
| Amortization of net loss | — |
| | — |
| | (26 | ) | Net periodic postretirement cost | $ | 3,932 |
| | $ | 3,256 |
| | $ | 2,612 |
| Other Changes in Benefit Obligations Recognized in Other Comprehensive Income (Loss) | |
| | |
| | |
| Net (gain) loss | $ | (2,846 | ) | | $ | (2,829 | ) | | $ | 373 |
| Prior service cost | 815 |
| | — |
| | — |
| Amortization of prior service cost | (111 | ) | | — |
| | — |
| Amortization of net loss | — |
| | — |
| | 26 |
| Total recognized in other comprehensive income | (2,142 | ) | | (2,829 | ) | | 399 |
| Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ | 1,790 |
| | $ | 427 |
| | $ | 3,011 |
|
|
Assumptions to determine projected postretirement benefit obligations and postretirement costs | Assumptions used to determine projected postretirement benefit obligations and postretirement costs are as follows: | | | | | | | | | | | December 31, | | 2016 | | 2015 | | 2014 | Discount rate(1) | 4.30 | % | | 4.25 | % | | 4.00 | % | Health care cost trend rate for medical benefits assumed for next year (pre-65) | 7.50 | % | | 5.50 | % | | 6.00 | % | Health care cost trend rate for medical benefits assumed for next year (post-65) | 5.00 | % | | 5.50 | % | | 6.00 | % | Ultimate trend rate (pre-65) | 4.50 | % | | 4.50 | % | | 4.50 | % | Ultimate trend rate (post-65) | 4.50 | % | | 4.50 | % | | 4.50 | % | Year that the rate reaches the ultimate trend rate (pre-65) | 2023 |
| | 2018 |
| | 2018 |
| Year that the rate reaches the ultimate trend rate (post-65) | 2018 |
| | 2018 |
| | 2018 |
|
_______________________________________________________________________________ | | (1) | Represents the year end rates used to determine the projected benefit obligation. To compute postretirement cost in 2016, 2015 and 2014, respectively, the beginning of year discount rates of 4.25%, 4.00% and 4.75% were used. |
|
Effect of a one-percentage-point change in assumed health care cost trend rates | Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects: | | | | | | | | | (In thousands) | 1-Percentage-Point Increase | | 1-Percentage-Point Decrease | Effect on total of service and interest cost | $ | 968 |
| | $ | (721 | ) | Effect on postretirement benefit obligation | 6,828 |
| | (5,338 | ) |
|
Schedule of estimated benefit payments | The following estimated benefit payments under the Company's postretirement plans, which reflect expected future service, are expected to be paid as follows: | | | | (In thousands) | | 2017 | 1,249 |
| 2018 | 1,344 |
| 2019 | 1,488 |
| 2020 | 1,625 |
| 2021 | 1,708 |
| Years 2022 - 2026 | 10,489 |
|
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