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Defined Benefit Plans (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Integer7
Sep. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Integer3
Integer7
Dec. 31, 2019
USD ($)
Integer3
Change in Benefit Obligation            
Benefit obligation at beginning of year       $ 4,887 $ 192,061  
Service cost       0 668 $ 647
Interest cost       95 5,893 7,210
Actuarial loss       (61) 18,605  
Group annuity transactions [1]       0 (76,650)  
Benefits paid [2]       (470) (135,690)  
Benefit obligation at end of year   $ 4,887   4,451 4,887 192,061
Change in plan assets            
Fair value of plan assets at beginning of year       0 168,651  
Actual return on plan assets       0 30,930  
Employer contributions       470 12,759  
Group annuity transactions $ (19,800)     0 [1] (76,650) [1]  
Benefits Paid [2]       (470) (135,690)  
Fair value of plan assets at end of year   0   0 0 168,651
Underfunded status   (4,887)   (4,451) (4,887)  
Amounts recognized on our Conolidated Balance Sheets            
Current liabilities   (367)   (1,054) (367)  
Noncurrent liabilities   (4,520)   (3,397) (4,520)  
Net liability   (4,887)   (4,451) (4,887)  
Amounts recognized in accumulated other comprehensive loss            
Net actuarial loss   1,443   1,401 1,443  
Prior service cost   0   0 0  
Net loss recognized   1,443   1,401 1,443  
Accumulated benefit obligation   4,900   4,500 4,900  
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss            
Service cost       0 668 647
Interest cost       95 5,893 7,210
Expected return on plan assets       0 (5,493) (5,903)
Amortization of actuarial (gain) loss       (19) 807 (175)
Plan settlement expense   $ (6,200) $ (1,300) 0 [3] (6,250) [3] (1,342) [3]
Net periodic benefit cost       76 8,125 3,121
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss            
Net actuarial (gain) loss       (61) (6,832) 4,642
Amortization of actuarial gain (loss) [4]       19 (807) 175
Effects of settlements [4]       0 (6,250) (1,342)
Total recognized in other comprehensive (income) loss       (42) (13,889) 3,475
Total recognized in net periodic cost and other comprehensive (income) loss       34 (5,764) 6,596
Plan settlement expense         $ (6,300) $ (1,300)
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost            
Discount rate         3.10% 4.15%
Expected long-term rate of return on plan assets         3.50% 3.85%
Rate of compensation increases [5]         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
Pension contributions       470 $ 12,759 $ 5,238
Estimated Future Contributions            
Defined Benefit Plan, Expected Future Benefit Payment, Year One       1,000    
Percentage of defined benefit plan assets transferred out of the plan 10.00%          
Pension Plan, Repurchases [Member]            
Pension Contributions            
Pension Contributions From Repurchase Of Properties Previously Contributed To Pension Plan         11,400 3,600
Pension Plan [Member]            
Pension Contributions            
Pension contributions       $ 500 12,800 5,200
Pension Contributions From Repurchase Of Properties Previously Contributed To Pension Plan         11,400 3,600
Pension Contributions From Lease Payments         $ 600 $ 1,100
[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, and 2019 includes $6.3 million and $1.3 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 11, 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.