GOODWILL AND INTANGIBLE ASSETS, NET (Details 2) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Intangible Assets, Net
Gross carrying amount	$ 338,497,000		338,497,000
Accumulated amortization	(102,142,000)		(93,251,000)
Net book value	236,355,000		245,246,000
Amortization expense for definite lived intangible assets	8,891,000	9,466,000
2015	37,900,000
2016	34,500,000
2017	30,300,000
2018	26,400,000
2019	23,200,000
Trademarks and trade names
Intangible Assets, Net
Gross carrying amount	13,889,000		13,889,000
Accumulated amortization	(5,196,000)		(5,016,000)
Net book value	8,693,000		8,873,000
Trademarks and trade names | Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	13 years		13 years
Customer related intangible assets
Intangible Assets, Net
Gross carrying amount	289,308,000		289,308,000
Accumulated amortization	(87,871,000)		(79,606,000)
Net book value	201,437,000		209,702,000
Customer related intangible assets | Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	10 years		10 years
Operating agreement
Intangible Assets, Net
Gross carrying amount	35,000,000		35,000,000
Accumulated amortization	(9,042,000)		(8,604,000)
Net book value	25,958,000		26,396,000
Operating agreement | Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	20 years		20 years
Intellectual property
Intangible Assets, Net
Gross carrying amount	300,000		300,000
Accumulated amortization	(33,000)		(25,000)
Net book value	$ 267,000		275,000
Intellectual property | Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	10 years		10 years