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DEBT - Table Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Nov. 15, 2016
Nov. 10, 2016
Jun. 08, 2016
Dec. 31, 2015
Nov. 04, 2015
Jul. 14, 2015
Apr. 07, 2015
Dec. 31, 2014
Line of Credit Facility                  
Principal amount $ 523,577       $ 588,434        
Principal amount 524,377       588,434        
PIK interest 800                
Less: Unamortized debt issuance costs (11,357)       (9,411)        
Less: Current portion (4,576)       (579,023)        
Long-term debt, noncurrent 508,444                
Secured Debt | $400 Million Credit Facility                  
Line of Credit Facility                  
Principal amount 400,000                
PIK interest 800   $ 800            
Less: Unamortized debt issuance costs (7,967)                
Maximum borrowing capacity 400,000   $ 400,000 $ 400,000          
Secured Debt | $100 Million Term Loan Facility                  
Line of Credit Facility                  
Principal amount         60,100        
Less: Unamortized debt issuance costs         (1,201)        
Maximum borrowing capacity 100,000       100,000        
Secured Debt | $253 Million Term Loan Facility                  
Line of Credit Facility                  
Principal amount         145,268        
Less: Unamortized debt issuance costs         (2,528)        
Maximum borrowing capacity 253,000       253,000        
Secured Debt | $44 Million Term Loan Facility                  
Line of Credit Facility                  
Principal amount         38,500        
Less: Unamortized debt issuance costs         (584)        
Maximum borrowing capacity         44,000        
Secured Debt | $22 Million Term Loan Facility                  
Line of Credit Facility                  
Principal amount         18,625        
Less: Unamortized debt issuance costs         (376)        
Maximum borrowing capacity         22,000   $ 22,000    
Secured Debt | 2014 Term Loan Facilities                  
Line of Credit Facility                  
Principal amount 28,306       31,069        
Less: Unamortized debt issuance costs (1,522)       (1,715)        
Line of Credit Facility | $98 Million Credit Facility                  
Line of Credit Facility                  
Principal amount 95,271       98,271        
Less: Unamortized debt issuance costs (1,868)       (2,368)        
Maximum borrowing capacity 98,000 $ 98,000       $ 98,000      
Line of Credit Facility | $148 Million Credit Facility                  
Line of Credit Facility                  
Principal amount         140,383        
Less: Unamortized debt issuance costs         (639)        
Maximum borrowing capacity $ 148,000       148,000   $ 148,000   $ 148,000
Revolving Credit Facility | 2015 Revolving Credit Facility                  
Line of Credit Facility                  
Principal amount         $ 56,218        
Maximum borrowing capacity               $ 59,500