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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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