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Commitments and Contingencies (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies [Abstract]      
Rent Expenses $ 9,000 $ 9,900 $ 8,500
Line of credit reserve $ 627 $ 567