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Debt (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
June 30,
2013
 
December 31,
2012
5.25% unsecured senior notes due January 2014 (a)
$
—

 
$
187,970

5.70% unsecured senior notes due May 2014 (a)
—

 
208,274

5.20% unsecured senior notes due February 2015 (a)
95,624

 
95,615

5.25% unsecured senior notes due June 2015 (a)
231,402

 
264,058

6.50% unsecured senior notes due May 2016 (a)
458,369

 
457,154

7.625% unsecured senior notes due October 2017 (b)
149,535

 
149,481

7.875% unsecured senior notes due June 2032 (a)
299,174

 
299,152

6.375% unsecured senior notes due May 2033 (a)
398,529

 
398,492

6.00% unsecured senior notes due February 2035 (a)
299,429

 
299,417

7.375% unsecured senior notes due June 2046 (a)
150,000

 
150,000

Total senior notes – carrying value (c)
$
2,082,062

 
$
2,509,613

Estimated fair value
$
2,159,514

 
$
2,663,451


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