GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Intangible assets
Net carrying amount	$ 225,364,000	$ 219,247,000
Amortization expense	24,400,000	24,700,000	13,400,000
Future amortization expense
2014	36,800,000
2015	21,100,000
2016	15,900,000
2017	14,400,000
2018	13,600,000
Customer relationships
Intangible assets
Gross carrying amount	231,620,000	229,300,000
Accumulated amortization	(44,144,000)	(31,478,000)
Net carrying amount	187,476,000	197,822,000
Customer contracts
Intangible assets
Gross carrying amount	70,233,000	42,033,000
Accumulated amortization	(32,345,000)	(20,608,000)
Net carrying amount	$ 37,888,000	$ 21,425,000