COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Subsidiary
Future minimum lease payments for operating leases [Abstract]
2018	$ 5,819
2019	4,194
2020	3,717
2021	3,112
2022	1,357
Thereafter	448
Total future minimum lease payments for operating leases	18,647
Rent expense for leases	8,200	$ 7,900	$ 8,800
Other commitments [Abstract]
Outstanding purchase orders related to raw materials	45,400	31,000
Outstanding purchase orders related to capital expenditures	3,000	$ 2,800
Arezzo Revenue Agency [Member]
Loss Contingencies [Line Items]
Noncurrent liability and offsetting indemnification asset	$ 12,000
Setec [Member]
Loss Contingencies [Line Items]
Number of subsidiaries named in the lawsuit | Subsidiary			3