GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Amortizing and Non-amortizing intangible assets
Gross Carrying Amount	$ 150,050		$ 150,050
Accumulated Amortization	95,064		90,099
Amortization of identifiable intangible assets	4,966	6,769
Customer relationships
Amortizing and Non-amortizing intangible assets
Gross Carrying Amount	124,512		124,512
Accumulated Amortization	77,920		73,713
Weighted average remaining life	7 years
Trade names
Amortizing and Non-amortizing intangible assets
Gross Carrying Amount	6,591		6,591
Accumulated Amortization	1,854		1,650
Weighted average remaining life	8 years
Non-compete agreements
Amortizing and Non-amortizing intangible assets
Gross Carrying Amount	18,947		18,947
Accumulated Amortization	$ 15,290		$ 14,736
Weighted average remaining life	5 years