OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Accrued employee compensation	$ 35,492	$ 41,144
Customer deposits	34,255	30,484
Warranty	9,793	9,174
Contingent payout	1,100	1,100
Other	30,373	22,256
Other current liabilities	$ 111,013	$ 104,158