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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (22,234)    
Transition adjustment (1,062,442)   $ (1,088,105)
Transition adjustment (20,392)   $ (29,080)
Ending balance 6,206    
Interest Rate Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (9,363) $ (27,819)  
Gains arising during period 8,189 176  
Amounts reclassified from accumulated other comprehensive loss 6,124 8,111  
Net other comprehensive income (loss) 14,313 8,287  
Ending balance 4,950 (19,532)  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (16,419) (26,623)  
Gains arising during period (6,437) 8,324  
Amounts reclassified from accumulated other comprehensive loss 707 588  
Net other comprehensive income (loss) (5,730) 8,912  
Ending balance (22,149) (17,711)  
Accumulated Other-than-Temporary Impairment of Investment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (3,298) (3,509)  
Amounts reclassified from accumulated other comprehensive loss 105 105  
Net other comprehensive income (loss) 105 105  
Ending balance (3,193) (3,404)  
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (29,080) (57,951)  
Gains arising during period 1,752 8,500  
Amounts reclassified from accumulated other comprehensive loss 6,936 8,804  
Net other comprehensive income (loss) 8,688 17,304  
Ending balance $ (20,392) $ (40,647)