Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Summary of Financial Instruments at Carrying and Fair Value) (Details)

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Fair Value Measurements (Summary of Financial Instruments at Carrying and Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
May 19, 2017
Dec. 31, 2016
Oct. 03, 2016
6.125% senior unsecured notes due 2024        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument, interest rate, stated (as a percent) 6.125% 6.125%   6.125%
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Credit Facility $ 0   $ 0  
6.125% Senior Notes 595,115   390,219  
Total 595,115   390,219  
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Credit Facility 0   0  
6.125% Senior Notes 621,000   412,000  
Total $ 621,000   $ 412,000