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Commitments and Contingencies - (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies [Abstract]        
Line of Credit, Current   $ 60,000    
Standard Product Warranty Accrual $ 1,823 1,836 $ 1,894 $ 1,574
Product Warranty Accrual, Warranties Issued 1,300 1,261    
Product Warranty Accrual, Payments $ 1,051 $ 1,319