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Income Taxes - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Provisional income tax expense	$ 26,600
Benefit of tax loss carryback under CARES Act	(31,468)
Change in valuation allowance relating to operating loss carryforwards	3,200
Combined impact of expense (Benefit)	48,800
Unrecognized tax benefits	0
Accrued interest and penalties	0
CSFL
Income Taxes
Provisional income tax expense	119,100
Federal
Income Taxes
Operating loss carryforwards	91,900	$ 31,500
Federal | CSFL
Income Taxes
Operating loss carryforwards	62,900
Annual limitation on operating loss carryforwards	16,000
Valuation allowance relating to operating loss carryforwards	20,700
State
Income Taxes
Operating loss carryforwards	222,900	$ 108,600
Valuation allowance relating to operating loss carryforwards	$ 7,100

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