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Senior Notes (Details)
3 Months Ended 6 Months Ended
May 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
d
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit     $ 188,000,000 $ 42,400,000
Debt Issuance Costs, Gross   $ 900,000 900,000  
Proceeds from the issuance of the 6.625% senior notes     320,125,000 0
Interest Expense, Debt     1,900,000  
Amortization of Debt Issuance Costs     320,000 $ 408,000
Senior Notes [Member]        
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit $ 291,400,000      
Debt Issuance Costs, Gross   $ 1,400,000 $ 1,400,000  
Stated interest rate percentage   6.625% 6.625%  
Debt Instrument, Term     95 months  
Debt Instrument, Interest Rate During Period   6.87% 6.69%  
Principal amount   $ 325,000,000 $ 325,000,000  
Proceeds from the issuance of the 6.625% senior notes $ 320,100,000      
Long-term Debt, Fair Value   329,300,000 329,300,000  
Debt Instrument, Discount Rate 1.50%      
Debt Instrument, Unamortized Discount   4,900,000 $ 4,900,000  
Debt Instrument, Redemption Price, Percentage     106.625%  
Debt Instrument, Convertible, Threshold Trading Days | d     180  
Interest Expense, Debt   1,900,000    
Amortization of Debt Issuance Costs   $ 38,000 $ 11,000  
Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Amount Threshold, Percentage   100.00% 100.00%  
Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Amount Threshold, Percentage   40.00% 40.00%  
Debt Instrument, Amount Threshold Retention, Percentage   60.00% 60.00%  
Senior Notes [Member] | Debt Instrument, Redemption, Period Three [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage     101.00%  
Senior Notes [Member] | Debt Instrument, Redemption, Period Four [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage     100.00%