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Debt (Tables)
 12 Months Ended
Dec. 31, 2012
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Our senior notes are summarized as follows ($000’s omitted):
 
December 31,
 
2012
 
2011
5.45% unsecured senior notes due August 2012 (a)
—

 
96,795

6.25% unsecured senior notes due February 2013 (a)
—

 
62,677

5.125% unsecured senior notes due October 2013 (a)
—

 
117,197

5.25% unsecured senior notes due January 2014 (a)
187,970

 
255,882

5.70% unsecured senior notes due May 2014 (a)
208,274

 
311,900

5.20% unsecured senior notes due February 2015 (a)
95,615

 
207,906

5.25% unsecured senior notes due June 2015 (a)
264,058

 
270,551

6.50% unsecured senior notes due May 2016 (a)
457,154

 
469,147

7.625% unsecured senior notes due October 2017 (b)
149,481

 
149,373

7.875% unsecured senior notes due June 2032 (a)
299,152

 
299,108

6.375% unsecured senior notes due May 2033 (a)
398,492

 
398,418

6.00% unsecured senior notes due February 2035 (a)
299,417

 
299,390

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

 
150,000

Total senior notes – carrying value (c)
$
2,509,613

 
$
3,088,344

Estimated fair value
$
2,663,451

 
$
2,765,151
Schedule of Financial Services available credit lines
The following is aggregate borrowing information for our mortgage operations as of each year-end ($000’s omitted):
 
 
December 31,
 
2012
 
2011
 
2010
Available credit lines
$
150,000

 
$
2,500

 
$
2,500

Unused credit lines
$
11,205

 
$
2,500

 
$
2,500

Weighted-average interest rate
3.00
%
 
4.50
%
 
4.50
%