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Senior Notes (Tables)
9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Summary of Outstanding Senior Notes

At September 30, 2017, our outstanding senior notes were comprised of the following debt issues:

 

     Principal                 Semiannual
     Amount           Interest Rate     Interest Payment

Debt Issue

   (In millions)      Maturity Date    Coupon     Effective     Dates

3.45% Senior Notes due 2023

   $ 250.0      November 1, 2023      3.45     3.50   May 1 and November 1

7.875% Senior Notes due 2025

   $ 500.0      August 15, 2025      7.875     8.00   February 15 and August 15

5.70% Senior Notes due 2039

   $ 500.0      October 15, 2039      5.70     5.75   April 15 and October 15

4.875% Senior Notes due 2043

   $ 750.0      November 1, 2043      4.875     4.89   May 1 and November 1
Summary of Carrying Value of Outstanding Senior Notes, Net of Unamortized Discount and Debt Issuance Costs

At September 30, 2017, the carrying value of our outstanding senior notes, net of unamortized discount and debt issuance costs, was as follows:

 

     September 30,
2017
 
     (In thousands)  

3.45% Senior Notes due 2023

   $ 248,090  

7.875% Senior Notes due 2025

     489,200  

5.70% Senior Notes due 2039

     492,930  

4.875% Senior Notes due 2043

     741,632  
  

 

 

 

Total senior notes, net

   $ 1,971,852