Income Taxes - Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax expense at federal rate of 21% (35% pre-2018)									$ 15,164	$ 19,278	$ 15,250
State income taxes, net of federal benefit									1,227	5,246	(2,238)
Change in valuation allowance									(12,760)	12,657	(1,884)
Foreign tax rate differential									(2,535)	(4,796)	(15,622)
Unrecognized tax benefit increase									898	1,262	3,007
Tax effect of foreign operations									6,698	8,546	5,532
Tax benefit of research & development									(2,506)	(2,557)	(1,904)
Transition tax									0	(8,112)	20,867
Revaluation of deferred tax balances									0	(4,937)	14,953
Performance-based compensation									(560)	(4,541)	2,081
Domestic production activities									0	0	(3,793)
Other									(478)	832	2,188
Total	$ 35,166	$ 5,136	$ (22,531)	$ (12,623)	$ 21,054	$ 2,012	$ 3,764	$ (3,952)	$ 5,148	$ 22,878	$ 38,437