OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Accrued employee compensation	$ 30,457	$ 41,144
Customer deposits	40,063	30,484
Warranty	9,681	9,174
Contingent payout	1,100	1,100
Other	28,342	22,256
Other current liabilities	$ 109,643	$ 104,158