Income Taxes - Valuation Allowance Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation allowance [Abstract]
Valuation Allowances, Beginning Balance	$ 13,834	$ 7,520	$ 7,401
Purchase Accounting Adjustment	7,148	13,752	0
Additional Valuation Allowance	2,738	832	650
Allowance Utilization and Other	(2,153)	(8,227)	(471)
Exchange Rate Changes and Other Adjustments	(56)	(43)	(60)
Valuation Allowance, Ending Balance	$ 21,511	$ 13,834	$ 7,520