Nature of Operations and Basis of Presentation - Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income tax benefit, CARES Act			$ 0	$ 11,095,000
Federal income tax expense (benefit)	$ 2,522,000	$ (1,724,000)	6,524,000	(34,189,000)
Liability for unrecognized tax benefits	$ 0		0		$ 0
Payment for income taxes			29,000	35,000
Federal tax refund received			$ 0	$ 0