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DEBT - Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility      
Deferred financing costs, noncurrent $ 13,094 $ 16,272  
Amortization of deferred financing costs 3,788 3,035 $ 2,325
Payment of debt extinguishment costs   2,962  
$400 Credit Facility, the $98 Million Credit Facility, and the 2014 Term Loan Facilities      
Line of Credit Facility      
Payment of debt extinguishment costs   2,962  
Interest Expense      
Line of Credit Facility      
Amortization of deferred financing costs $ 3,788 $ 3,035 $ 2,325