Taxes (Schedule of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 34,709	$ 31,789	$ 31,150
Additions based on tax positions related to the current year	4,168	2,920	1,199
Additions for tax positions of prior years			688
Reductions as a result of lapses in the statute of limitations	0		(1,248)
Ending Balance	$ 38,877	$ 34,709	$ 31,789