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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
 1 Months Ended 7 Months Ended 12 Months Ended
Apr. 22, 2016
USD ($)
May 31, 2017
USD ($)
option
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2016
USD ($)
Loss Contingencies [Line Items]              
Net rent expense on operating leases     $ 19,200 $ 47,100 $ 44,700   $ 19,700
Future minimum lease payments not included in total       $ 70,000      
Heartland              
Loss Contingencies [Line Items]              
Total purchase consideration $ 3,922,820 $ 37,500       $ 3,922,820  
Term of operating lease contract   20 years          
Number of renewal options on operating leases | option   4          
Renewal term on operating leases   5 years