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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal $ 230 $ (965) $ 8,337
State and local 161 (39) 518
Foreign 72 0 0
Total current expense (benefit) 463 (1,004) 8,855
Federal 4,611 (2,221) 537
State and local 48 416 2
Foreign 0 0 0
Total deferred income tax expense (benefit) 4,659 (1,805) 539
Total income tax expense (benefit) $ 5,122 $ (2,809) $ 9,394