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Debt (Tables)
3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
March 31,
2017
 
December 31,
2016
7.625% unsecured senior notes due October 2017 (a)
123,000

 
123,000

4.250% unsecured senior notes due March 2021 (b)
700,000

 
700,000

5.500% unsecured senior notes due March 2026 (b)
700,000

 
700,000

5.000% unsecured senior notes due January 2027 (b)
600,000

 
600,000

7.875% unsecured senior notes due June 2032 (b)
300,000

 
300,000

6.375% unsecured senior notes due May 2033 (b)
400,000

 
400,000

6.000% unsecured senior notes due February 2035 (b)
300,000

 
300,000

Net premiums, discounts, and issuance costs (c)
(12,996
)
 
(12,984
)
Total senior notes
$
3,110,004

 
$
3,110,016

Estimated fair value
$
3,206,575

 
$
3,112,297



(a)
Not redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b)
Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(c)
The carrying value of senior notes reflects the impact of premiums, discounts, and issuance costs that are amortized to interest cost over the respective terms of the senior notes.