Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income tax (benefit expense [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		34.00%
Current income tax expense	$ 423	$ 628
Deferred income tax benefit	(108)	(17,316)
Income tax expense (benefit)	$ 315	$ (16,688)