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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance $ 1,163,265 $ 897,935
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 1,205 908
Net current-period other comprehensive income (loss) 1,205 908
Equity, ending balance 1,569,187 885,320
Defined Benefit Pension Items    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (99,789) (98,734)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 1,187 902
Net current-period other comprehensive income (loss) 1,187 902
Equity, ending balance (98,602) (97,832)
Actuarial gain (loss) tax amount 374 286
Other    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (330) (255)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI, net of tax 18 6
Net current-period other comprehensive income (loss) 18 6
Equity, ending balance (312) (249)
Total    
Accumulated Other Comprehensive Loss [Roll Forward]    
Equity, beginning balance (100,119) (98,989)
Equity, ending balance $ (98,914) $ (98,081)