COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases
2017	$ 8,125
2018	5,813
2019	3,371
2020	1,914
2021	593
2022 and Thereafter	577
Total Future Minimum Lease Payments	20,393
Capital Leases
2017	766
2018	749
2019	503
2020	387
2021	0
2022 and Thereafter	0
Total Future Minimum Lease Payments	2,405
Total
2017	8,891
2018	6,562
2019	3,874
2020	2,301
2021	593
2022 and Thereafter	577
Total Future Minimum Lease Payments	22,798
Rent expense for leased facilities and equipment	7,300	$ 7,200	$ 7,600
Purchase commitment	$ 38,000
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%