COMMITMENTS AND CONTINGENCIES- Leases and Purchase Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, 2015 (six months)	$ 2,274		$ 2,274
Operating Leases, 2016	7,991		7,991
Operating Leases, 2017	6,847		6,847
Operating Leases, 2018	4,787		4,787
Operating Leases, 2019	2,810		2,810
Operating Leases, 2020 and thereafter	2,448		2,448
Operating Leases, Total	27,157		27,157
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital Leases, 2015 (six months)	73		73
Capital Leases, 2016	122		122
Capital Leases, 2017	62		62
Capital Leases, 2018	11		11
Capital Leases, 2019	0		0
Capital Leases, 2020 and thereafter	0		0
Capital Leases, Total	268		268
Operating and Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Total, 2015 (six months)	2,347		2,347
Total, 2016	8,113		8,113
Total, 2017	6,909		6,909
Total, 2018	4,798		4,798
Total, 2019	2,810		2,810
Total, 2020 and thereafter	2,448		2,448
Total	27,425		27,425
Operating Leases, Rent Expense	1,800	$ 2,000	5,400	$ 5,900
Long-term Purchase Commitment, Amount	$ 12,800		$ 12,800
Minimum
future minimum payments due [Line Items]
Capital lease interest rate	3.00%		3.00%
Maximum
future minimum payments due [Line Items]
Capital lease interest rate	7.00%		7.00%