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LONG-TERM DEBT AND CREDIT AGREEMENT Carrying Value of Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Nov. 09, 2017
Dec. 31, 2016
Feb. 26, 2016
Debt Instrument [Line Items]        
Term Loan, net $ 102,751   $ 92,208  
Convertible Notes Payable 105,974   101,587  
Line of Credit, Current 1,679      
Other Long-term Debt, Noncurrent     0  
Total debt 210,404   193,795  
Long-term Debt 204,498   188,795  
Cerberus Business Finance LLC [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 115,000    
Long-term Debt [Member] | Cerberus Business Finance LLC [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 3,499   4,042  
Long-term Debt       $ 100,000
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 17,026   $ 23,413