GOODWILL AND INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross Carrying Value	$ 185,838	$ 183,128
Accumulated Amortization	(83,183)	(80,778)
Net Carrying Value	102,655	102,350
Customer lists
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross Carrying Value	138,228	138,149
Accumulated Amortization	(70,685)	(69,904)
Net Carrying Value	67,543	68,245
Non-compete agreements
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross Carrying Value	14,383	13,170
Accumulated Amortization	(7,341)	(6,891)
Net Carrying Value	7,042	6,279
Developed technology
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross Carrying Value	23,390	23,000
Accumulated Amortization	(2,635)	(1,843)
Net Carrying Value	20,755	21,157
Other
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross Carrying Value	9,837	8,809
Accumulated Amortization	(2,522)	(2,140)
Net Carrying Value	$ 7,315	$ 6,669