Income Taxes (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]
Beginning Balance	$ 3,265	$ 3,115	$ 3,020
Additions for tax positions related to current year	0	43	41
Additions for tax positions of prior years	5,879	107	131
Reductions for tax position of prior years	0	0	(77)
Ending Balance	$ 9,144	$ 3,265	$ 3,115