Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2016
Income Tax Contingency [Line Items]
Provisional tax benefit		$ 11,100
Undistributed earnings of foreign subsidiaries		54,500
Provisional income tax expense		5,300
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense	$ (500)
Deferred tax assets, valuation allowance	3,828		$ 16,553
Unrecognized tax benefits	2,084	1,916	2,293	$ 1,881
Unrecognized tax benefits that would impact effective tax rate	2,100	1,900	2,300
Deferred tax liability, not recognized, amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries		$ 1,700
Foreign investments	$ (1,261)		(1,026)
Research Tax Credit Carryforward
Income Tax Contingency [Line Items]
Tax credit carryforward, amount			2,400
Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards			12,800
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards			110,300
Tax credit carryforward, amount			1,100
Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards			$ 15,000