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Indebtedness - Issuances and Principal Repayment (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 24, 2017
Mar. 15, 2017
Jan. 13, 2017
Mar. 31, 2017
Mar. 31, 2016
Indebtedness          
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses       $ 598,246 $ 737,612
Repurchase of convertible senior notes       $ 8,431 $ 0
Senior unsecured notes, due 2027 at 4.95%          
Indebtedness          
Interest rate, stated percentage       4.95%  
Senior unsecured notes          
Indebtedness          
Issuance of senior notes     $ 600,000    
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses     593,300    
Senior unsecured notes | Senior unsecured notes, due 2023 at 4.5%          
Indebtedness          
Issuance of senior notes     $ 200,000    
Interest rate, stated percentage     4.50%    
Senior unsecured notes | Senior unsecured notes, due 2027 at 4.95%          
Indebtedness          
Issuance of senior notes     $ 400,000    
Interest rate, stated percentage     4.95%    
Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%          
Indebtedness          
Interest rate, stated percentage   3.80%      
Repurchase of convertible senior notes   $ 8,431      
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%          
Indebtedness          
Repurchase of convertible senior notes $ 47