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Nature of Operations and Basis of Presentation (Income Taxes) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income tax benefit, CARES Act	$ 0	$ 9,500,000
Federal income tax expense (benefit)	4,002,000	$ (32,465,000)
Liability for unrecognized tax benefits	$ 0		$ 0

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- Definition

Income Tax Expense (Benefit), Net Operating Loss, CARES Act

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of unrecognized tax benefits.

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