Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (22,234)
Transition adjustment	(1,112,726)		$ (1,088,105)
Transition adjustment	(19,094)		$ (29,080)
Ending balance	(36,844)
Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,363)	$ (27,819)
Gains arising during period	6,070	602
Amounts reclassified from accumulated other comprehensive loss	3,949	4,001
Net other comprehensive income (loss)	10,019	4,603
Ending balance	656	(23,216)
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		1,436
Amounts reclassified from accumulated other comprehensive loss	(86)	8
Net other comprehensive income (loss)	(86)	1,444
Ending balance	(16,505)	(25,179)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,298)	(3,509)
Amounts reclassified from accumulated other comprehensive loss	53	53
Net other comprehensive income (loss)	53	53
Ending balance	(3,245)	(3,456)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(29,080)	(57,951)
Gains arising during period	6,070	2,038
Amounts reclassified from accumulated other comprehensive loss	3,916	4,062
Net other comprehensive income (loss)	9,986	6,100
Ending balance	$ (19,094)	$ (51,851)