Income Taxes (Narrative) (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
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit) on operations	$ (4,249)	$ 1,450	$ 9,066	$ 1,835	$ 690	$ 3,467	$ 3,820	$ 3,233	$ 8,102	$ 11,210	$ 7,533
Effective income tax rate									11.80%	17.20%	14.30%
Unremitted earnings of foreign subsidiaries					56,894					$ 56,894
General business tax credit carry forwards, expiration date											Dec. 31, 2025
Liability for uncertain tax positions reduction to noncurrent asset	3,449								$ 3,449
Liability for uncertain tax positions, noncurrent	0								0
Unrecognized tax benefits that would impact effective tax rate	3,449				3,481				3,449	3,481
Gross interest and penalties expense (benefit)									(5)	(13)	$ (33)
Accrued payment of interest and penalties	0				$ 19				0	19
Impairment of Goodwill									0	$ 0	$ 0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	57,817								57,817
General business and foreign tax credit carry forwards	1,711								1,711
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	23,851								23,851
General business and foreign tax credit carry forwards	1,354								1,354
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
General business and foreign tax credit carry forwards	$ 15,833								$ 15,833