COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases
Operating Leases, Total Future Minimum Lease Payments, 2019	$ 8,934
Operating Leases, Total Future Minimum Lease Payments, 2020	7,143
Operating Leases, Total Future Minimum Lease Payments, 2021	6,252
Operating Leases, Total Future Minimum Lease Payments, 2022	4,797
Operating Leases, Total Future Minimum Lease Payments, 2023	3,320
Operating Leases, Total Future Minimum Lease Payments, 2024 and Thereafter	7,470
Operating Leases, Total Future Minimum Lease Payments	37,916
Capital Leases
Capital Leases, Total Future Minimum Lease Payments, 2019	679
Capital Leases, Total Future Minimum Lease Payments, 2020	311
Capital Leases, Total Future Minimum Lease Payments, 2021	0
Capital Leases, Total Future Minimum Lease Payments, 2022	0
Capital Leases, Total Future Minimum Lease Payments, 2023	0
Capital Leases, Total Future Minimum Lease Payments, 2024 and Thereafter	0
Capital Leases, Total Future Minimum Lease Payments	990
Total
Total Future Minimum Lease Payments, 2019	9,613
Total Future Minimum Lease Payments, 2020	7,454
Total Future Minimum Lease Payments, 2021	6,252
Total Future Minimum Lease Payments, 2022	4,797
Total Future Minimum Lease Payments, 2023	3,320
Total Future Minimum Lease Payments, 2024 and Thereafter	7,470
Total Future Minimum Lease Payments	38,906
Rent expense for leased facilities and equipment	$ 8,100	$ 7,700	$ 7,300
Minimum
Future minimum lease payment for operating and capital leases
Capital lease interest rate	3.00%
Maximum
Future minimum lease payment for operating and capital leases
Capital lease interest rate	7.00%