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Debt and Credit Facilities 5.625% Senior Notes due December 2026 (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 22, 2016
Debt Instrument [Line Items]      
Document Period End Date Dec. 31, 2017    
5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Senior Notes, Noncurrent $ 494,453 $ 494,298 $ 500,000
Debt Instrument, Interest Rate, Stated Percentage 5.625%   5.625%
Proceeds from Issuance of Senior Long-term Debt   $ 495,000  
Change of Control [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 101.00%    
Before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 100.00%    
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage 35.00%    
Before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage 50.00%    
Asset Sale [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 100.00%    
At any time and from time to time before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 105.625%