Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Provisional one-time transition tax, 2017 Tax Act					$ 2,200
Income tax benefit related to net operating loss					3,900
Provisional deferred tax liability, undistributed foreign earnings, 2017 Tax Act			$ 1,500		1,800
Provisional undistributed accumulated earnings of foreign subsidiary, 2017 Tax Act			14,100		25,500
Income tax expense, 2017 Tax Act		$ 800
Global intangible low-taxed income recognized			12,900	$ 15,600
Deferred tax liabilities, gross		2,867	7,880	2,867
Valuation allowance adjustment			(600)
Valuation allowance		14,455	14,867	14,455
Undistributed earnings of foreign subsidiaries		143,000	159,000	143,000
Unremitted earnings withholding taxes			1,500
Additional unremitted earnings withholding taxes			17,500
Net income taxes paid			11,100	7,300	4,100
Unrecognized tax benefits, income tax penalties and interest accrued		100	0	100	100
Penalties and interest accrued		100	100	100	100
Unrecognized tax benefits that would impact effective tax rate		900	1,400	900	$ 800
Maximum
Income Taxes [Line Items]
Expected change in unrecognized tax benefits statute lapse			100
State and Local Jurisdiction
Income Taxes [Line Items]
Valuation allowance		1,000	$ 800	1,000
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Statutes of limitations range			3 years
State and Local Jurisdiction | Maximum
Income Taxes [Line Items]
Statutes of limitations range			4 years
Foreign Tax Authority | Minimum
Income Taxes [Line Items]
Increase in unrecognized tax benefits is reasonably possible			$ 100
Statutes of limitations range			3 years
Foreign Tax Authority | Maximum
Income Taxes [Line Items]
Increase in unrecognized tax benefits is reasonably possible			$ 200
Statutes of limitations range			10 years
United States
Income Taxes [Line Items]
Valuation allowance		12,300	$ 11,800	12,300
United States | State and Local Jurisdiction
Income Taxes [Line Items]
Valuation allowance		8,057	8,411	8,057
Net Operating and Capital Loss Carryforward
Income Taxes [Line Items]
Valuation allowance		$ 2,200	$ 3,100	$ 2,200
Dynamic Systems Inc.
Income Taxes [Line Items]
Deferred tax liabilities, gross	$ 17,000
Deferred tax liabilities, intangible assets	4,100
Valuation allowance adjustment	$ (2,500)