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Defined Benefit Plans (Details)
$ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Aug. 10, 2018
USD ($)
Apr. 25, 2018
USD ($)
Dec. 31, 2020
USD ($)
Integer7
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Aug. 09, 2018
 [6]
Apr. 24, 2018
 [6]
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Integer7
Integer3
Dec. 31, 2019
USD ($)
Integer3
Dec. 31, 2018
USD ($)
Integer3
Defined Benefit Plan Disclosure [Line Items]                          
Percentage of defined benefit plan assets transferred out of the plan 10.00%                       60.00%
Change in Benefit Obligation                          
Benefit obligation at beginning of year                     $ 192,061 $ 176,852  
Service cost                     668 647 $ 794
Interest cost                     5,893 7,210 11,344
Actuarial loss                     18,605 29,065  
Group annuity transactions [1]                     (76,650) (19,848)  
Benefits paid [2]                     (135,690) (1,865)  
Benefit obligation at end of year       $ 4,887           $ 176,852 4,887 192,061 176,852
Change in plan assets                          
Fair value of plan assets at beginning of year                     168,651 154,801  
Actual return on plan assets                     30,930 29,769  
Employer contributions                     12,759 5,238  
Group annuity transactions $ (19,800) $ (124,800) $ (151,800)               (76,650) [1] (19,292) [1]  
Benefits Paid [2]                     (135,690) (1,865)  
Fair value of plan assets at end of year       0           $ 154,801 0 168,651 154,801
Underfunded status       (4,887)             (4,887) (23,410)  
Amounts recognized on our Conolidated Balance Sheets                          
Current liabilities       (367)             (367) (878)  
Noncurrent liabilities       (4,520)             (4,520) (22,532)  
Net liability       (4,887)             (4,887) (23,410)  
Amounts recognized in accumulated other comprehensive loss                          
Net actuarial loss       1,443             1,443 15,332  
Prior service cost       0             0 0  
Net loss recognized       1,443             1,443 15,332  
Accumulated benefit obligation       4,900             4,900 192,100  
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss                          
Service cost                     668 647 794
Interest cost                     5,893 7,210 11,344
Expected return on plan assets                     (5,493) (5,903) (11,097)
Amortization of actuarial (gain) loss                     807 (175) 1,497
Plan settlement expense       $ 6,200 $ 1,300 $ 11,300 $ 12,000       6,250 [3] 1,342 [3] 23,255 [3]
Net periodic benefit cost                     8,125 3,121 25,793
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss                          
Net actuarial (gain) loss                     (6,832) 4,642 (14,178)
Amortization of actuarial gain (loss) [4]                     (807) 175 (1,497)
Effects of settlements [4]                     (6,250) (1,342) (23,255)
Total recognized in other comprehensive (income) loss                     (13,889) 3,475 (38,930)
Total recognized in net periodic cost and other comprehensive (income) loss                     (5,764) 6,596 (13,137)
Plan settlement expense                     $ (6,300) $ (1,300) $ (23,300)
Weighted Average Assumptions Used in Measurement of Benefit Obligation                          
Discount rate       2.00%             2.00% 3.10%  
Rate of compensation increases [5]       0.00%             0.00% 0.00%  
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                          
Discount rate               4.05% 3.40% 3.95% 3.10% 4.15% [6]  
Expected long-term rate of return on plan assets               4.50% 4.75% 3.85% 3.50% 3.85% [6]  
Rate of compensation increases [5]                     0.00% 0.00% 0.00%
Pension Contributions                          
Number of real property contributed to the qualified defined benefit pension plan | Integer7       4             4    
Number of repurchased real property | Integer3                     2 1 1
Pension contributions                     $ 12,759 $ 5,238 $ 26,081
Estimated Future Contributions                          
Estimated 2021 contributions       $ 400             400    
Expected Future Benefit Payments                          
2021       367             367    
2022       380             380    
2023       382             382    
2024       368             368    
2025       314             314    
Years 2026-2030       1,373             1,373    
Pension Plan, Repurchases [Member]                          
Pension Contributions                          
Pension contributions                     11,400 3,600 4,000
Pension Plan [Member]                          
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss                          
Plan settlement expense       $ (6,200)                  
Pension Contributions                          
Pension contributions                     12,800 5,200 26,100
Pension Plan, Discretionary Contributions [Member]                          
Pension Contributions                          
Pension contributions                         20,000
Pension Plan, Lease Payments [Member]                          
Pension Contributions                          
Pension contributions                     $ 600 $ 1,100 $ 1,500
[1] See Defined Benefits Plans above for description of group annuity transactions.
[2] See Defined Benefits Plans above for description of lump-sum payments.
[3] Plan settlement expense during the years ended December 31, 2020, 2019, and 2018 includes $6.3 million, $1.3 million and $23.3 million, respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts, as well as lump-sum payments in 2020.
[4] 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 12, Retirement and Benefit Plans.
[5] Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero.
[6] Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05%, respectively, and the expected rates of return on plan assets were 4.75% and 4.50%, respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85%, respectively.