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Commitments (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies [Abstract]      
Rent Expenses $ 8,500 $ 9,200 $ 9,700
Line of credit reserve $ 667 $ 667