COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent expense for leased facilities and equipment	$ 7,200	$ 7,600	$ 7,900
Operating Leases
2016	8,271
2017	7,267
2018	5,284
2019	3,048
2020	1,565
2021 and Thereafter	1,111
Total Future Minimum Lease Payments	26,546
Capital Leases
2016	122
2017	62
2018	11
2019	0
2020	0
2021 and Thereafter	0
Total Future Minimum Lease Payments	195
Total
2016	8,393
2017	7,329
2018	5,295
2019	3,048
2020	1,565
2021 and Thereafter	1,111
Total Future Minimum Lease Payments	$ 26,741
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%