Income Taxes (Summary of Uncertain Tax Positions Included in Income Tax Provision) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Abstract]
Current (provision) benefit for UTPs	$ (704)	$ (636)	$ (2,069)	$ (1,774)
Deferred benefit (provision) for UTPs	226	289	701	801
Tax (provision) benefit for UTPs	$ (478)	$ (347)	$ (1,368)	$ (973)