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Commitments and Contingencies (Minimum Future Rental Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies [Abstract]      
2019 $ 1,007    
2020 726    
2021 205    
Thereafter 40    
Total 1,978    
Aggregate office rent expenses $ 583 $ 523 $ 528