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Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense:    
Foreign $ 1,467 $ 634
Federal 121 0
State and local 45 5
Current income tax expense 1,633 639
Deferred income tax expense (benefit):    
Foreign 312 (137)
Federal (139) (217)
State and local 2 0
Deferred income tax expense (benefit) 175 (354)
Provision for income taxes $ 1,808 $ 285