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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Intangible Assets, Net      
Gross carrying amount $ 271,421   $ 324,796
Accumulated amortization (199,261)   (233,143)
Net book value 72,160   91,653
Amortization expense for definite lived intangible assets 8,647 $ 7,147  
2019 19,600    
2020 13,300    
2021 10,600    
2022 5,300    
2023 5,300    
Customer related intangible assets      
Intangible Assets, Net      
Gross carrying amount 219,797   273,172
Accumulated amortization (172,892)   (207,639)
Net book value 46,905   65,533
Operating agreement      
Intangible Assets, Net      
Gross carrying amount 35,000   35,000
Accumulated amortization (16,064)   (15,632)
Net book value 18,936   19,368
Trademarks and trade names      
Intangible Assets, Net      
Gross carrying amount 11,349   11,349
Accumulated amortization (6,412)   (6,244)
Net book value 4,937   5,105
Non-compete agreements      
Intangible Assets, Net      
Gross carrying amount 1,230   1,230
Accumulated amortization (1,103)   (1,026)
Net book value 127   204
Intellectual property      
Intangible Assets, Net      
Gross carrying amount 300   300
Accumulated amortization (145)   (145)
Net book value 155   155
Other intangible assets      
Intangible Assets, Net      
Gross carrying amount 3,745   3,745
Accumulated amortization (2,645)   (2,457)
Net book value $ 1,100   $ 1,288
Weighted Average | Customer related intangible assets      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 8 years    
Weighted Average | Operating agreement      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 20 years    
Weighted Average | Trademarks and trade names      
Intangible Assets, Net      
Weighted average estimated useful life (in years) 15 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