Income Taxes (Reconciliation of Beginning and Ending Amount of Consolidated Liability for Unrecognized Income Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Balance at January 1	$ 3,437	$ 7,417	$ 6,631
Additions for tax positions related to current year	454	769	756
Settlements due to lapse of time	(988)	(4,834)
Foreign currency translation effect		85	30
Balance at December 31	$ 2,903	$ 3,437	$ 7,417