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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance $ 1,569,187 $ 885,320 $ 1,163,265 $ 897,935
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 1,206 905 2,411 1,813
Net current-period other comprehensive income (loss) 1,206 905 2,411 1,813
Equity, ending balance 1,850,739 863,614 1,850,739 863,614
Defined Benefit Pension Items        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (98,602) (97,832) (99,789) (98,734)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 1,186 899 2,373 1,801
Net current-period other comprehensive income (loss) 1,186 899 2,373 1,801
Equity, ending balance (97,416) (96,933) (97,416) (96,933)
Actuarial gain (loss) tax amount 375 288 749 574
Other        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (312) (249) (330) (255)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 20 6 38 12
Net current-period other comprehensive income (loss) 20 6 38 12
Equity, ending balance (292) (243) (292) (243)
Total        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (98,914) (98,081) (100,119) (98,989)
Equity, ending balance $ (97,708) $ (97,176) $ (97,708) $ (97,176)