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Commitments (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Commitments and Contingencies [Abstract]          
Rent Expenses $ 2,300 $ 2,300 $ 4,400 $ 4,700  
Line of credit reserve $ 667   $ 667   $ 667