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Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory income tax rate	21.00%	21.00%	21.00%
Tax benefit (provision) at U.S. statutory rate	$ (18,348)	$ 56,742	$ 121,320
State taxes, net of federal income tax	(11,909)	10,423	21,576
Uncertain tax positions	27,913	(60,376)	5,713
Goodwill impairment	0	0	(88,265)
Impact of the Tax Cuts and Jobs Act	0	0	(6,042)
Stock compensation	(2,118)	(2,639)	(4,717)
Tax credits	0	(106)	(688)
Meals and entertainment	(169)	(416)	(493)
Other	(721)	(1,359)	(324)
Total	$ (5,352)	$ 2,269	$ 49,456

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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