Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefit netted against a deferred tax asset for a net operating loss carryforward	$ (341)		$ (341)		$ (341)
Unrecognized tax benefits, period increase (decrease)			(59)	$ (3,280)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Additions for tax positions related to current year	29	$ 2,762	59	$ 3,280
Ending Balance	$ 9,203		$ 9,203