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Financing (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Outstanding financing facilities
 
June 30, 2018
 
December 31, 2017
Revolving Credit Facility, weighted-average variable interest rate of 3.210%
$
125,000

 
$
346,000

$500 million, 4.875% Senior Notes due 2021(1), effective interest rate of 4.954%
497,968

 
497,565

$300 million, 4.625% Senior Notes due 2021(2), effective interest rate of 4.645%
299,102

 
298,961

$300 million, 3.800% Senior Notes due 2022(3), effective interest rate of 3.845%
298,392

 
298,214

$300 million, 3.850% Senior Notes due 2023(4), effective interest rate of 3.851%
298,701

 
298,583

$500 million, 3.550% Senior Notes due 2026(5), effective interest rate of 3.570%
496,014

 
495,792

$750 million, 3.600% Senior Notes due 2027(6), effective interest rate of 3.619%
743,569

 
743,275

$500 million, 4.350% Senior Notes due 2028(7), effective interest rate of 4.383%
494,792

 

Long-term debt
$
3,253,538

 
$
2,978,390

(1) 
Net of unamortized discount of $0.9 million as of June 30, 2018, and $1.1 million as of December 31, 2017, and debt issuance costs of $1.1 million as of June 30, 2018, and $1.4 million as of December 31, 2017.
(2) 
Net of unamortized discount of $0.2 million as of June 30, 2018, and December 31, 2017, and debt issuance costs of $0.7 million as of June 30, 2018, and $0.8 million as of December 31, 2017.
(3) 
Net of unamortized discount of $0.5 million as of June 30, 2018, and $0.6 million as of December 31, 2017, and debt issuance costs of $1.1 million as of June 30, 2018, and $1.2 million as of December 31, 2017.
(4) 
Net of unamortized discount of less than $0.1 million as of June 30, 2018, and December 31, 2017, and debt issuance costs of $1.3 million as of June 30, 2018, and $1.4 million as of December 31, 2017.
(5) 
Net of unamortized discount of $0.7 million as of June 30, 2018, and December 31, 2017, and debt issuance costs of $3.3 million as of June 30, 2018, and $3.5 million as of December 31, 2017.
(6) 
Net of unamortized discount of $1.1 million as of June 30, 2018, and $1.2 million as of December 31, 2017, and debt issuance costs of $5.3 million as of June 30, 2018 and $5.6 million as of December 31, 2017.
(7) 
Net of unamortized discount of $1.3 million as of June 30, 2018, and debt issuance costs of $3.9 million as of June 30, 2018.