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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Accrual at beginning of the year $ 3,140 $ 2,622
Provision 1,750 3,076
Settlement and Other (2,069) (2,558)
Accrual at end of year $ 2,821 $ 3,140