Income Taxes (Summary of Income Tax Benefit (Provision)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Abstract]
Current income tax provision	$ (316)	$ (834)	$ (918)	$ (1,388)
Deferred income tax (provision) benefit	(1,844)	5,902	(3,308)	7,043
Income tax benefit (provision)	$ (2,160)	$ 5,068	$ (4,226)	$ 5,655

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration