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DEBT - Debt Facilities (Details) - USD ($)
12 Months Ended
Jun. 29, 2017
Mar. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 06, 2017
Feb. 11, 2014
Jul. 31, 2013
Debt Instrument [Line Items]                
Proceeds from equity offering     $ 20,777,000 $ 83,267,000 $ 0      
Private Placement | Common Stock                
Debt Instrument [Line Items]                
Proceeds from equity offering $ 15,900,000 $ 5,100,000            
Associated issuance costs $ 200,000              
2017 Warrants | Common Stock                
Debt Instrument [Line Items]                
Warrant exercise threshold 4.99%              
Warrant remeasurement adjustment     3,600,000          
Fair value of warrants     $ 20,495,000          
Revolving Credit Facility | Senior Notes | Revolving Credit Facility                
Debt Instrument [Line Items]                
Aggregate principal debt amount               $ 75,000,000.0
Term Loan B Facility | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal debt amount               250,000,000.0
Delayed Draw Term Loan B Facility | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal debt amount               $ 150,000,000.0
Priming Credit Agreement | Credit Facility                
Debt Instrument [Line Items]                
Aggregate principal debt amount           $ 25,000,000    
First Lien Note Facility | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal debt amount $ 200,000,000              
Quarterly installment amortization     0.625%          
Early repayment premium base rate     5.00%          
Principal prepayment limit     $ 50,000,000          
Penalty interest rate increase     2.00%          
First Lien Note Facility | Senior Notes | Redemption Period One                
Debt Instrument [Line Items]                
Early repayment premium     4.00%          
First Lien Note Facility | Senior Notes | Redemption Period Two                
Debt Instrument [Line Items]                
Early repayment premium     2.00%          
First Lien Note Facility | Senior Notes | Redemption Period Three                
Debt Instrument [Line Items]                
Early repayment premium     0.00%          
First Lien Note Facility | Senior Notes | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate     6.00%          
First Lien Note Facility | Senior Notes | Base Rate | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate     0.50%          
First Lien Note Facility | Senior Notes | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate     7.00%          
First Lien Note Facility | Senior Notes | LIBOR | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.00%          
First Lien Note Facility | Senior Notes | Prime Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.00%          
Second Lien Note Facility | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal debt amount 100,000,000              
Early repayment premium base rate     5.00%          
Penalty interest rate increase     2.00%          
Second Lien Note Facility | Senior Notes | Redemption Period One                
Debt Instrument [Line Items]                
Early repayment premium     4.00%          
Second Lien Note Facility | Senior Notes | Redemption Period Two                
Debt Instrument [Line Items]                
Early repayment premium     2.00%          
Second Lien Note Facility | Senior Notes | Redemption Period Three                
Debt Instrument [Line Items]                
Early repayment premium     0.00%          
Second Lien Note Facility | Senior Notes | Option One                
Debt Instrument [Line Items]                
Basis spread on variable rate     9.25%          
Second Lien Note Facility | Senior Notes | Option Two                
Debt Instrument [Line Items]                
Basis spread on variable rate     11.25%          
Second Lien Note Facility | Senior Notes | Option Three                
Debt Instrument [Line Items]                
Basis spread on variable rate     10.25%          
Second Lien Note Facility | Senior Notes | Option Three, Half Cash                
Debt Instrument [Line Items]                
Basis spread on variable rate     4.625%          
Second Lien Note Facility | Senior Notes | Option Three, Half Capitalized Interest                
Debt Instrument [Line Items]                
Basis spread on variable rate     5.625%          
Second Lien Note Facility | Senior Notes | LIBOR | Option One | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.25%          
Second Lien Delayed Draw Notes | Senior Notes                
Debt Instrument [Line Items]                
Delayed draw permitted $ 10,000,000              
Period subsequent to closing for delayed draw 18 months              
2021 Notes Indenture                
Debt Instrument [Line Items]                
Aggregate principal debt amount             $ 200,000,000.0  
Stated interest rate     8.875%       8.875%