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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Intangible Assets, Net      
Gross carrying amount $ 333,787   $ 333,787
Accumulated amortization (187,501)   (178,355)
Net book value 146,286   155,432
Amortization expense for definite lived intangible assets 9,146 $ 12,211  
2017 35,400    
2018 26,700    
2019 21,200    
2020 17,300    
2021 12,600    
Trademarks and trade names      
Intangible Assets, Net      
Gross carrying amount 15,354   15,354
Accumulated amortization (8,026)   (7,724)
Net book value 7,328   7,630
Customer related intangible assets      
Intangible Assets, Net      
Gross carrying amount 277,828   277,828
Accumulated amortization (165,094)   (156,980)
Net book value 112,734   120,848
Operating agreement      
Intangible Assets, Net      
Gross carrying amount 35,000   35,000
Accumulated amortization (12,542)   (12,104)
Net book value 22,458   22,896
Non-compete agreements      
Intangible Assets, Net      
Gross carrying amount 1,560   1,560
Accumulated amortization (604)   (507)
Net book value 956   1,053
Intellectual property      
Intangible Assets, Net      
Gross carrying amount 300   300
Accumulated amortization (92)   (85)
Net book value 208   215
Other intangible assets      
Intangible Assets, Net      
Gross carrying amount 3,745   3,745
Accumulated amortization (1,143)   (955)
Net book value $ 2,602   $ 2,790
Weighted Average | Trademarks and trade names      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 13 years    
Weighted Average | Customer related intangible assets      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 10 years    
Weighted Average | Operating agreement      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 20 years    
Weighted Average | Non-compete agreements      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 4 years    
Weighted Average | Intellectual property      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 10 years    
Weighted Average | Other intangible assets      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 5 years