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Income Taxes - Income Tax (Benefit) Expense Attributable to (Loss) Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
U.S. federal, Current						$ (366)	$ 0	$ 0
U.S. state and local, Current						(157)	6,147	0
Total, Current		$ (3)	$ (363)	$ (366)	$ (366)	(523)	6,147	0
U.S. federal, Deferred						(24,489)	(434,585)	(25,322)
U.S. state and local, Deferred						(540)	(71,853)	(5,167)
Total, Deferred	$ (36,509)	(22,263)	29,361	7,098	(29,411)	(25,029)	(506,438)	(30,489)
U.S. federal, Total						(24,855)	(434,585)	(25,322)
U.S. state and local, Total						(697)	(65,706)	(5,167)
Total (benefit) expense for income taxes	$ (36,509)	$ (22,266)	$ 28,998	$ 6,732	$ (29,777)	$ (25,552)	$ (500,291)	$ (30,489)

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