GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Intangible Assets [Line Items]
Gross carrying value	$ 67,354	$ 73,693
Accumulated amortization	(60,320)	(59,193)
Net carrying value	7,034	14,500
Noncompete agreements
Intangible Assets [Line Items]
Gross carrying value	2,269	2,269
Accumulated amortization	(1,935)	(1,710)
Net carrying value	334	559
Patents, trademarks and tradename
Intangible Assets [Line Items]
Gross carrying value	1,435	3,106
Accumulated amortization	(293)	(263)
Net carrying value	1,142	2,843
Customer relationships and contracts
Intangible Assets [Line Items]
Gross carrying value	58,797	59,045
Accumulated amortization	(53,923)	(52,303)
Net carrying value	4,874	6,742
Developed technology
Intangible Assets [Line Items]
Gross carrying value	4,074	8,494
Accumulated amortization	(3,390)	(4,138)
Net carrying value	684	4,356
Customer backlog
Intangible Assets [Line Items]
Gross carrying value	779	779
Accumulated amortization	(779)	(779)
Net carrying value	$ 0	$ 0