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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.