Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Income Tax Expense (Benefit)
Federal	$ 0	$ 420	$ 66
State	79	541	984
Foreign	7	49	460
Current Income Tax Expense (Benefit)	86	1,010	1,510
Deferred Income Tax Expense (Benefit)
Federal	(13,766)	80	1,857
State	(4,866)	132	(122)
Foreign	(32,819)	20,806	(444)
Change in valuation allowance	24,913	0	300
Deferred Income Tax Expense (Benefit)	(26,538)	21,018	1,591
Income tax (benefit) provision	$ (26,452)	$ 22,028	$ 3,101

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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