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Debt (Tables)
 3 Months Ended
Mar. 31, 2012
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
March 31, 2012
 
December 31, 2011
5.45% unsecured senior notes due August 2012 (b)
$
96,634

 
$
96,795

6.25% unsecured senior notes due February 2013 (b)
62,692

 
62,677

5.125% unsecured senior notes due October 2013 (b)
117,522

 
117,197

5.25% unsecured senior notes due January 2014 (b)
255,887

 
255,882

5.70% unsecured senior notes due May 2014 (b)
312,613

 
311,900

5.20% unsecured senior notes due February 2015 (b)
207,916

 
207,906

5.25% unsecured senior notes due June 2015 (b)
271,557

 
270,551

6.50% unsecured senior notes due May 2016 (b)
469,774

 
469,147

7.625% unsecured senior notes due October 2017 (a)
149,400

 
149,373

7.875% unsecured senior notes due June 2032 (b)
299,119

 
299,108

6.375% unsecured senior notes due May 2033 (b)
398,436

 
398,418

6.00% unsecured senior notes due February 2035 (b)
299,396

 
299,390

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

 
150,000

Total senior notes – carrying value (c)
$
3,090,946

 
$
3,088,344

Estimated fair value
$
3,030,286

 
$
2,765,151

(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 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