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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nov. 15, 2016
Nov. 10, 2016
Dec. 31, 2015
Nov. 04, 2015
Fair value of financial instruments            
Floating rate debt $ 524,424 $ 524,377        
Secured Debt | $400 Million Credit Facility            
Fair value of financial instruments            
Floating rate debt 404,941          
Face amount of term loan facility 400,000 400,000   $ 400,000    
Line of Credit Facility | $98 Million Credit Facility            
Fair value of financial instruments            
Face amount of term loan facility 98,000 98,000 $ 98,000   $ 98,000 $ 98,000
Carrying Value            
Fair value of financial instruments            
Cash and cash equivalents 174,479 133,400        
Restricted cash 30,467 35,668        
Floating rate debt 524,424 524,377        
Fair value            
Fair value of financial instruments            
Cash and cash equivalents 174,479 133,400        
Restricted cash 30,467 35,668        
Floating rate debt $ 524,424 $ 524,377