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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loss on Debt Extinguishment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
May 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 15, 2016
Nov. 10, 2016
Nov. 04, 2015
Impairment of long-lived assets              
Loss on debt extinguishment $ 4,533            
$400 Million Credit Facility | Secured Debt              
Impairment of long-lived assets              
Maximum borrowing capacity     $ 400,000 $ 400,000   $ 400,000  
$98 Million Credit Facility | Line of Credit Facility              
Impairment of long-lived assets              
Maximum borrowing capacity     $ 98,000   $ 98,000   $ 98,000
$460 Million Credit Facility | Secured Debt              
Impairment of long-lived assets              
Maximum borrowing capacity $ 460,000 $ 460,000