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Debt - Term Loan Credit Agreement (Details) - USD ($)
Apr. 28, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
May 05, 2010
Debt Instrument [Line Items]          
Interest payable   $ 396,000 $ 15,603,000    
10.5% Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate (as a percent)   10.50%   10.50% 10.50%
Interest payable   $ 0 $ 15,400,000    
Effective interest rate (as a percent)     10.20%    
Term Loan Credit Agreement          
Debt Instrument [Line Items]          
Interest payable   $ 200,000 $ 0    
Effective interest rate (as a percent)   8.20%      
Term Loan Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 345,000,000        
Incremental commitments $ 50,000,000        
Issuance price (as a percent) 97.00%        
Discount bps 3.00%        
Percent of outstanding voting stock 65.00%        
Percent of aggregate principal 1.25%        
Payment amount $ 4,300,000        
Term Loan Credit Agreement | Line of Credit | Base Rate          
Debt Instrument [Line Items]          
Spread on variable rate basis (as a percent) 5.00%        
Term Loan Credit Agreement | Line of Credit | LIBOR          
Debt Instrument [Line Items]          
Spread on variable rate basis (as a percent) 6.00%        
Term Loan Credit Agreement | Line of Credit | LIBOR | Minimum          
Debt Instrument [Line Items]          
Spread on variable rate basis (as a percent) 1.00%