Income Taxes and Deferred Tax Asset/Liability - Income Tax Expense (Benefit) Components (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current tax expense	$ 288	$ 118	$ 88
Deferred tax expense	1,450	0	0
Total tax expense	$ 1,738	$ 118	$ 88

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

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