Income Taxes (Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Decrease to unrecognized tax benefits	$ 2,477	$ 4,921	$ 3,062
Interest expense	(2,011)	(103)	(1,757)
Penalties	387	1,393	1,250
Total	$ 853	$ 6,211	$ 2,555