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Defined Benefit Plans (Details) $ in Thousands |  |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2016 USD ($) | May 15, 2015 USD ($) | Mar. 09, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | May 14, 2015 | [6] | Dec. 31, 2015 USD ($) | Oct. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Integer4 Integer5 Integer7 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Retirement Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of qualified defined benefit pension plan | Integer4 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of plans for hourly employees merged to the qualified defined benefit pension plan | Integer4 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  |  |  |  |  |  |  |  | $ 484,079 |  | $ 483,525 | $ 460,192 | $ 484,079 |  |
Service cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,204 | 1,127 |  | $ 739
Interest cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,542 | 18,798 |  | 19,067
Actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,112 | 154 |  |
Benefits Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,525) | (43,966) | [1] |
Benefit obligation at end of year |  |  |  |  | $ 460,192 |  | $ 460,192 |  | $ 484,079 |  |  |  |  | 483,525 | 460,192 |  | 484,079
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  |  |  |  |  |  |  |  | $ 399,462 |  | $ 422,255 | 389,440 | 399,462 |  |
Actual return on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,147 | 30,100 |  |
Employer contributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,193 | 3,844 |  |
Benefits paid |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,525) | (43,966) | [1] |
Fair value of plan assets at end of year |  |  |  |  | 389,440 |  | 389,440 |  | $ 399,462 |  |  |  |  | 422,255 | 389,440 |  | 399,462
Underfunded status |  |  |  |  | (70,752) |  | (70,752) |  |  |  |  |  |  | (61,270) | (70,752) |  |
Amounts recognized on our Conolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  | (804) |  | (804) |  |  |  |  |  |  | (715) | (804) |  |
Noncurrent liabilities |  |  |  |  | (69,948) |  | (69,948) |  |  |  |  |  |  | (60,555) | (69,948) |  |
Net liability |  |  |  |  | (70,752) |  | (70,752) |  |  |  |  |  |  | (61,270) | (70,752) |  |
Amounts recognized in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  | 59,540 |  | 59,540 |  |  |  |  |  |  | 50,787 | 59,540 |  |
Prior service cost |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 |  |
Net loss recognized |  |  |  |  | 59,540 |  | 59,540 |  |  |  |  |  |  | 50,787 | 59,540 |  |
Defined Benefit Plan, lump-sum cash settlement |  | $ 21,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  | $ 460,200 |  | 460,200 |  |  |  |  |  |  | 483,500 | 460,200 |  |
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,204 | 1,127 |  | 739
Interest cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,542 | 18,798 |  | 19,067
Expected return on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,968) | (20,324) |  | (22,366)
Amortization of actuarial (gain) loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,686 | 2,484 |  | 4,884
Plan settlement/curtailment expense |  | $ 3,900 |  |  |  |  | $ 2,400 |  |  |  |  |  |  | 0 | 4,155 | [2] | 501
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,464 | 6,240 |  | 2,825
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,067) | (9,622) |  | (8,406)
Amortization of actuarial loss | [3] |  |  |  |  |  |  |  |  |  |  |  |  | (1,686) | (2,484) |  | (4,884)
Effects of settlements | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (4,155) |  | (501)
Total recognized in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,753) | (16,261) |  | (13,791)
Total recognized in net periodic cost and other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,289) | $ (10,021) |  | $ (10,966)
Defined Benefit Plans, Estimated Future Net Periodic Benefit Cost For The Next Year |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800 |  |  |
Defined Benefit Plan, Future Amortization of Loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,300) |  |  |
Weighted Average Assumptions Used in Measurement of Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 3.90% |  | 3.90% |  |  |  |  |  |  | 3.40% | 3.90% |  |
Rate of compensation increases | [4] |  |  |  | 0.00% |  | 0.00% |  |  |  |  |  |  | 0.00% | 0.00% |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 3.45% | [5] |  | 3.75% | 3.90% | [6] | 4.05% | [5] |  | 3.90% |  |  |
Expected long-term rate of return on plan assets |  |  |  |  | 5.10% | [5] |  | 6.15% | 5.85% | [6] | 5.10% | [5] |  | 5.00% |  |  |
Rate of compensation increases | [4] |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  | 0.00%
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real property contributed to the qualified defined benefit pension plan | Integer7 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Contributed properties leaseback transaction lease term |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Number of extension options for contributed properties | Integer5 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Extension terms of contributed properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Annual rent escalation rate for contributed properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Pension contributions |  |  | $ 40,000 | $ 10,000 |  |  |  |  |  |  |  |  |  | $ 2,193 | $ 3,844 |  | $ 54,257
Lease payments included in pension contributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 | $ 1,400 |  | $ 1,300
Estimated Future Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated 2018 contributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Expected Future Benefit Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,702 |  |  |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,768 |  |  |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,501 |  |  |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,272 |  |  |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,885 |  |  |
Years 2023-2027 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,600 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  | 41.00% |  |  |
Large-Cap U.S. equity securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target Plan Asset Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset target allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |
Small- and mid-cap U.S. equity securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target Plan Asset Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset target allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
International Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target Plan Asset Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset target allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Fixed Income Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.00% |  |  |
Target Plan Asset Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset target allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 54.00% |  |  |
Hedge Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |
Target Plan Asset Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset target allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |
Real Estate Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |
[1] | Benefits paid during the year ended December 31, 2016 include approximately $21 million of lump-sum cash payments to certain terminated vested participants in settlement of pension obligations.
[2] | Plan settlement expense during the year ended December 31, 2016 includes a $3.9 million settlement charge related to lump-sum cash payments to certain terminated vested participants in settlement of pension obligations.
[3] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 9, Retirement and Benefit Plans.
[4] | Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero. In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering a minimal amount of hourly employees who continue to accrue benefits.
[5] | Prior to the remeasurement of our qualified defined benefit pension plan on November 1, 2016, the discount rate and expected rate of return on plan assets were 4.05% and 5.10%. The discount rate and expected rate of return on plan assets after the November 1, 2016 remeasurement were 3.45% and 5.10%, respectively.
[6] | Prior to the remeasurement of our qualified defined benefit pension plan on May 15, 2015, the discount rate and expected rate of return on plan assets were 3.75% and 6.15%. The discount rate and expected rate of return on plan assets after the May 15, 2015 remeasurement were 3.90% and 5.85%, respectively.

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