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Debt (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
March 31,
2018
 
December 31,
2017
4.250% unsecured senior notes due March 2021 (a)
$
700,000

 
$
700,000

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

 
700,000

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

 
600,000

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

 
300,000

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

 
400,000

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

 
300,000

Net premiums, discounts, and issuance costs (b)
(13,105
)
 
(13,057
)
Total senior notes
$
2,986,895

 
$
2,986,943

Other notes payable
100,823

 
20,024

Notes payable
$
3,087,718

 
$
3,006,967

Estimated fair value
$
3,076,140

 
$
3,263,774



(a)
Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b)
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.