Income Taxes (Unrecognized Tax Benefits Reconciliation Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 4,750	$ 4,957	$ 8,444	$ 31,616
Net expense related to increases in 2016 unrecognized tax benefits, net	300
Penalties and interest related to income tax examinations	200	200	800
Interest released	100
Cumulative accrued balance of penalties and interest related to income tax examinations	600	500	900
Unrecognized tax benefits that would reduce annual effective tax rate, if recognized	$ 4,800	$ 5,000	$ 8,400