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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance $ 1,850,739 $ 863,614 $ 1,163,265 $ 897,935
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 1,356 1,008 3,767 2,821
Net current-period other comprehensive income (loss) 1,356 1,008 3,767 2,821
Equity, ending balance 1,902,967 923,067 1,902,967 923,067
Defined Benefit Pension Items        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (97,416) (96,933) (99,789) (98,734)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 1,337 1,002 3,710 2,803
Net current-period other comprehensive income (loss) 1,337 1,002 3,710 2,803
Equity, ending balance (96,079) (95,931) (96,079) (95,931)
Actuarial gain (loss) tax amount 421 317 1,170 891
Other        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (292) (243) (330) (255)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI, net of tax 19 6 57 18
Net current-period other comprehensive income (loss) 19 6 57 18
Equity, ending balance (273) (237) (273) (237)
Total        
Accumulated Other Comprehensive Loss [Roll Forward]        
Equity, beginning balance (97,708) (97,176) (100,119) (98,989)
Equity, ending balance $ (96,352) $ (96,168) $ (96,352) $ (96,168)