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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance $ 1,970,434 $ 1,163,265
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 830 1,205
Net current-period other comprehensive income (loss) 830 1,205
Equity, ending balance 1,984,029 1,569,187
Defined Benefit Pension Items    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (73,713) (99,789)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 827 1,187
Net current-period other comprehensive income (loss) 827 1,187
Equity, ending balance (72,886) (98,602)
Actuarial gain (loss) tax amount 257 374
Other    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (196) (330)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 3 18
Net current-period other comprehensive income (loss) 3 18
Equity, ending balance (193) (312)
Total    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (73,909) (100,119)
Equity, ending balance $ (73,079) $ (98,914)