INTANGIBLE ASSETS, NET (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Intangible Assets, Net
Gross carrying amount	$ 327,782		$ 327,782
Accumulated amortization	(142,990)		(130,779)
Net book value	184,792		197,003
Amortization expense for definite lived intangible assets	12,211	$ 8,891
2016	35,700
2017	26,700
2018	23,600
2019	21,400
2020	19,500
Trademarks and trade names
Intangible Assets, Net
Gross carrying amount	15,244		15,244
Accumulated amortization	(6,822)		(6,491)
Net book value	$ 8,422		$ 8,753
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	$ 274,428		$ 274,428
Accumulated amortization	(124,881)		(113,725)
Net book value	$ 149,547		$ 160,703
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		$ 35,000
Accumulated amortization	(10,792)		(10,354)
Net book value	$ 24,208		$ 24,646
Operating agreement \| Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	20 years		20 years
Noncompete Agreements [Member]
Intangible Assets, Net
Gross carrying amount	$ 1,435		$ 1,435
Accumulated amortization	(219)		(115)
Net book value	$ 1,216		1,320
Noncompete Agreements [Member] \| Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	4 years
Intellectual property
Intangible Assets, Net
Gross carrying amount	$ 300		300
Accumulated amortization	(63)		(55)
Net book value	$ 237		$ 245
Intellectual property \| Weighted average
Intangible Assets, Net
Weighted average estimated useful life (in years)	10 years		10 years
Other Intangible Assets [Member]
Intangible Assets, Net
Weighted average estimated useful life (in years)	5 years
Gross carrying amount	$ 1,375		$ 1,375
Accumulated amortization	(213)		(39)
Net book value	$ 1,162		$ 1,336

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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