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Commitments (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Commitments and Contingencies [Abstract]          
Rent Expenses $ 3,200 $ 2,500 $ 5,400 $ 4,500  
Line of credit reserve $ 567   $ 567   $ 567