Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Schedule of Borrowings) (Details)

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Borrowings (Schedule of Borrowings) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
May 19, 2017
Dec. 31, 2016
Oct. 03, 2016
Principal components:        
Total principal outstanding $ 600,000   $ 400,000  
Premium on 6.125% senior unsecured notes due 2024, net of accumulated amortization 8,156   0  
Unamortized deferred financing costs (13,018)   (9,781)  
Total carrying value of borrowings 595,138   390,219  
Senior secured revolving credit facility        
Principal components:        
Total principal outstanding 0   0  
6.125% senior unsecured notes due 2024        
Principal components:        
Total principal outstanding $ 600,000   $ 400,000  
Debt instrument, interest rate, stated (as a percent) 6.125% 6.125%   6.125%