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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory U.S. federal income tax (benefit) provision									$ (2,252)	$ 14,363	$ 13,662
State income taxes, net of federal tax benefit									(647)	152	95
Tax credits and incentives									(2,791)	(6,297)	(5,159)
Foreign tax rate differential									90	1,347	710
Impact of change in enacted tax law									1,108	993	(848)
Change in valuation allowance									2,174	(138)	(1,922)
U.S. tax on foreign earnings									(433)	(3,373)	664
Compensation and benefits									362	(469)	839
Other									(385)	1,524	3,169
(Benefit) provision for income taxes	$ 920	$ 1,814	$ (6,721)	$ 1,213	$ (4,249)	$ 1,450	$ 9,066	$ 1,835	$ (2,774)	$ 8,102	$ 11,210

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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