Annual report pursuant to Section 13 and 15(d)

Borrowings (Schedule of Borrowings) (Details)

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Borrowings (Schedule of Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
May 19, 2017
Oct. 03, 2016
Principal components:        
Total principal outstanding $ 1,200,000 $ 625,000    
Premium on 6.125% Senior Notes, net of accumulated amortization 6,469 7,594    
Unamortized deferred financing costs (16,996) (12,398)    
Total carrying value of borrowings (a) 1,189,473 620,196    
Deferred financing costs 6,087 4,863    
Senior secured revolving credit facility        
Principal components:        
Total principal outstanding $ 200,000 25,000    
6.125% senior unsecured notes due 2024        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated (as a percent) 6.125%   6.125% 6.125%
Principal components:        
Total principal outstanding $ 600,000 600,000    
6.375% senior unsecured notes due 2026        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated (as a percent) 6.375%      
Principal components:        
Total principal outstanding $ 400,000 $ 0