Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT AND CAPITAL LEASE - Senior Secured Notes Narrative (Details)

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LONG-TERM DEBT AND CAPITAL LEASE - Senior Secured Notes Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 02, 2018
Apr. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]          
Outstanding principal     $ 99,750,000   $ 96,063,000
Loss on extinguishment of debt     2,673,000 $ 0  
Line of Credit | Term Loan          
Line of Credit Facility [Line Items]          
Loss on extinguishment of debt $ 2,700,000        
Line of Credit | First Lien Credit Facility | Term Loan          
Line of Credit Facility [Line Items]          
Outstanding principal 41,000,000   0   41,063,000
Line of Credit | Second Lien Credit Facility | Term Loan          
Line of Credit Facility [Line Items]          
Outstanding principal 55,000,000   0   55,000,000
Senior Secured Notes Due 2024 | Senior Notes          
Line of Credit Facility [Line Items]          
Face amount of senior secured notes $ 100,000,000        
Issue price, percentage 98.00%        
Discount percentage 2.00%        
Outstanding principal     $ 99,750,000   $ 0
Periodic payment of principal $ 250,000        
Balloon payment to be paid $ 94,000,000        
Redemption price, percentage 100.00%        
Subsequent Event          
Line of Credit Facility [Line Items]          
Notional amount   $ 50,000,000      
Derivative term   3 months      
Cap interest rate   3.00%      
LIBOR | Senior Secured Notes Due 2024 | Senior Notes          
Line of Credit Facility [Line Items]          
Variable rate floor 1.00%        
Applicable margin rate 7.00%