Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1	$ 3,466	$ 3,876	$ 1,414
Additions for tax positions of the current year	99	33	148
Additions for tax positions of prior years	0	0	2,955
Settlements and changes in judgment	(422)	(256)	(331)
Lapses of applicable statute of limitations	0	0	(310)
Divestitures and foreign currency translation	393	(187)	0
Balance as of December 31	$ 3,536	$ 3,466	$ 3,876