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Long-Term Debt (Senior Notes Narrative) (Details) - USD ($)
12 Months Ended
Apr. 22, 2016
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount   $ 24,536,000 $ 0
Senior Notes, maturing 2023 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400,000,000    
Debt Instrument, Interest Rate, Stated Percentage 11.625%    
Debt Instrument, Unamortized Discount $ 6,900,000    
Debt instrument issue discount percentage 1.734%    
Debt Instrument, Maturity Date Apr. 15, 2023    
Debt Instrument, Payment Terms   Payable semi-annually in arrears on April 15 and October 15 of each year, beginning on October 15, 2016.  
Debt Instrument, Frequency of Periodic Payment   semi-annually  
Debt Instrument, Date of First Required Payment Oct. 15, 2016    
Debt Instrument, Interest Rate, Effective Percentage   12.469%  
Debt Instrument, Redemption Price Percentage 100.00%    
Senior Notes, maturing 2023 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Price Percentage 35.00%