Income Taxes (Reconciliation of unrecognized tax benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 14,591	$ 10,177
Additions based on tax positions related to the current year	3,659	1,593
Additions for prior years tax positions	10,206	3,945
Reductions for prior years tax positions	(7,746)	(1,124)
Ending Balance	$ 20,710	$ 14,591