Income Taxes (Summary of Uncertain Tax Positions Included in Income Tax Provision) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Abstract]
Current (provision) benefit for UTPs	$ (791)	$ (704)	$ (2,018)	$ (2,069)
Deferred benefit (provision) for UTPs	167	226	425	701
Tax (provision) benefit for UTPs	$ (624)	$ (478)	$ (1,593)	$ (1,368)