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Debt and Credit Facilities 5.625% Senior Notes due December 2026 (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Dec. 31, 2016
Jun. 30, 2018
Sep. 30, 2017
Dec. 22, 2016
Debt Instrument [Line Items]        
Document Period End Date   Jun. 30, 2018    
5.625% Senior Notes due 2026 [Member]        
Debt Instrument [Line Items]        
Senior Notes, Noncurrent   $ 494,755 $ 494,298 $ 500,000
Debt Instrument, Interest Rate, Stated Percentage   5.625%   5.625%
Proceeds from Issuance of Senior Long-term Debt $ 495,000      
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%