Income Taxes (Schedule of Components of Benefit from Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current (benefit) provision, Federal									$ (1)	$ (28)	$ 8
Current (benefit) provision, State									86	21	5
Deferred provision (benefit), Federal									2,100	114	(3,501)
Deferred provision (benefit), State									(250)	568	(38)
Benefit related to a change in enacted tax law										(8,276)
Provision (benefit) for income taxes	$ (441)	$ 460	$ 1,139	$ 777	$ (7,884)	$ 176	$ 369	$ (262)	$ 1,935	$ (7,601)	$ (3,526)