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Debt - First Lien, Second Lien, and Exit Financing Facility (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 08, 2017
Mar. 30, 2016
Oct. 09, 2014
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]                  
Basis spread on variable rate   4.00%              
Loss on debt extinguishment $ 11,800,000     $ 15,000,000   $ 0 $ 14,968,609 $ 0  
Cash paid towards payment-in-kind interest on Second Lien Facility           0 17,426,244 0  
Accumulated payment in kind interest 77,400,000                
Revolving Credit Facility | Restructuring Support Agreement and Plan of Reorganization                  
Debt Instrument [Line Items]                  
Revolving credit facility     $ 50,000,000            
Long-term line of credit                 $ 40,000,000
Commitment fee percentage     40.00%            
Line of Credit | Restructuring Support Agreement and Plan of Reorganization                  
Debt Instrument [Line Items]                  
Revolving credit facility     $ 275,000,000            
Line of Credit | LIBOR | Restructuring Support Agreement and Plan of Reorganization | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     3.50%            
Line of Credit | LIBOR | Restructuring Support Agreement and Plan of Reorganization | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     4.00%            
First Lien Facility                  
Debt Instrument [Line Items]                  
Repayments of lines of credit           0 184,099,000 21,276,000  
First Lien Facility | First Lien Lenders                  
Debt Instrument [Line Items]                  
Long-term debt, net   $ 201,500,000              
Repayments of loans 171,100,000           13,000,000 5,700,000  
Loss on debt extinguishment 3,200,000                
First Lien Facility | First Lien Lenders | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Revolving credit facility   50,000,000              
Repayments of lines of credit $ 20,000,000       $ 5,000,000        
Second Lien Facility                  
Debt Instrument [Line Items]                  
Repayments of lines of credit           $ 0 $ 60,000,000 $ 0  
Second Lien Facility | Second Lien Lenders                  
Debt Instrument [Line Items]                  
Long-term debt, net   $ 60,000,000              
Second Lien Facility | Second Lien Lenders | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   14.00%              
LIBOR rate floor   1.00%