Income Taxes (Summary of Uncertain Tax Positions Included in Income Tax Provision) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Taxes [Abstract]
Current (provision) benefit for UTPs	$ (747)	$ (690)	$ (1,227)	$ (1,365)
Deferred benefit (provision) for UTPs	157	231	258	475
Tax (provision) benefit for UTPs	$ (590)	$ (459)	$ (969)	$ (890)