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Borrowings Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
May 18, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Loss on hedging activity     $ (5,310,000) $ (3,244,000)  
Senior Notes 2017          
Debt Instrument [Line Items]          
Face amount of debt instrument $ 500,000,000        
Interest rate of senior notes (as a percentage) 4.375% 4.375% 4.375%    
Unamortized discount $ 1,800,000        
Proceeds related to issuance of notes 493,900,000        
Underwriting fees 4,400,000        
Legal and professional costs 900,000        
Loss on hedging activity $ 5,300,000        
Debt instrument term (in years) 30 years        
Notice period for redemption (in days) 30 days        
Repurchase price as percentage of principal amount of senior notes (as a percentage) 101.00%        
Senior Notes 2007          
Debt Instrument [Line Items]          
Interest rate of senior notes (as a percentage)   6.55% 6.55%    
Extinguishment of debt   $ 250,000,000      
Commercial Paper          
Debt Instrument [Line Items]          
Interest rate of senior notes (as a percentage)   1.191% 1.191%    
Commercial paper maximum term (in days)     90 days    
Commerical paper outstanding   $ 39,957,000 $ 39,957,000   $ 0
Issued commercial paper       $ 0