Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 3,215	$ (1,694)	$ 18,951
State	400	120	507
Foreign	3,809	1,394	2,072
Current income tax expense (benefit)	7,424	(180)	21,530
Deferred:
Federal	(7,630)	(486)	1,038
State	(1,667)	(153)	(580)
Foreign	3,006	447	(1,645)
Deferred income tax benefit	(6,291)	(192)	(1,187)
Income tax expense (benefit)	$ 1,133	$ (372)	$ 20,343