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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entities      
Total capital leased assets excluded from VIE consolidation $ 29,562 $ 31,696  
Consolidated VIEs, aggregated | Minimum      
Variable Interest Entities      
Outsourcing agreement initial term 5 years    
Consolidated VIEs | Eliminations      
Variable Interest Entities      
Liabilities associated with the certain outsourcing agreements and purchase options $ 124,500 116,500  
Consolidated VIEs | Cunningham | Eliminations      
Variable Interest Entities      
Total capital leased assets excluded from VIE consolidation 4,500 4,500  
VIEs which are not primary beneficiary      
Variable Interest Entities      
Carrying amount of investments in VIEs 71,300 115,700  
Gain (loss) on equity investments $ (45,100) $ (5,300) $ 2,500