Income Taxes - Components of 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	Dec. 31, 2019	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Income (loss) before income taxes
Domestic							$ (26,460)	$ (72,293)	$ (32,982)
Foreign							4,870	(6,360)	4,582
Loss before income taxes							(21,590)	(78,653)	(28,400)
Currently payable:
Federal							377	(296)	(631)
State and local							4	37	36
Foreign							1,744	4,747	1,281
Total currently payable							2,125	4,488	686
Deferred:
Federal							27,705	(23,358)	(2,404)
State and local							305	(571)	(66)
Foreign							1,241	(5,059)	3,624
Total deferred	$ 24,700			$ (2,300)			29,251	(28,988)	1,154
Provision (benefit) for income taxes	33,214	$ 630	$ (3,831)		$ (3,201)	$ 30,013	31,376	(24,500)	1,840
Reconciliation of income tax expense to the U.S. Federal statutory income tax rate to actual tax provision
Tax at statutory rate							(4,534)	(16,517)	(5,962)
State income taxes, net of federal tax benefit							364	(531)	(54)
Effect of foreign items							1,502	1,004	834
Valuation allowance and unbenefited losses							33,478	(10,654)	6,018
Deferred tax rate changes							71	281	240
Transaction costs							(131)	671	531
Tax incentives							(311)	(56)	(91)
Disallowed foreign exchange loss							1,746	573	0
Warrants							0	0	0
Other							(809)	729	324
Provision (benefit) for income taxes	$ 33,214	$ 630	$ (3,831)		$ (3,201)	$ 30,013	$ 31,376	$ (24,500)	$ 1,840