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Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt Disclosure [Abstract]

Schedule of Senior Notes

Our senior notes are summarized as follows ($000’s omitted):

	December 31,
	2011				2010
8.125% unsecured senior notes due February 2011 (a)	$	—			$	13,900
5.45% unsecured senior notes due August 2012 (b)	96,795				104,823
6.25% unsecured senior notes due February 2013 (b)	62,677				62,617
5.125% unsecured senior notes due October 2013 (b)	117,197				160,212
5.25% unsecured senior notes due January 2014 (b)	255,882				335,848
5.70% unsecured senior notes due May 2014 (b)	311,900				309,048
5.20% unsecured senior notes due February 2015 (b)	207,906				244,839
5.25% unsecured senior notes due June 2015 (b)	270,551				397,700
6.50% unsecured senior notes due May 2016 (b)	469,147				466,644
7.625% unsecured senior notes due October 2017 (a)	149,373				149,265
7.875% unsecured senior notes due June 2032 (b)	299,108				299,065
6.375% unsecured senior notes due May 2033 (b)	398,418				398,344
6.00% unsecured senior notes due February 2035 (b)	299,390				299,363
7.375% unsecured senior notes due June 2046 (b)	150,000				150,000
Total senior notes – carrying value (c)	$	3,088,344			$	3,391,668
Estimated fair value	$	2,765,151			$	3,227,404

(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

Schedule of Extinguishment of Debt

During the last three years, we reduced our outstanding senior notes through a variety of transactions ($000’s omitted):

Retirement Date	Series	Transaction Type	Principal Retired
November / December 2011	5.25% unsecured senior notes due January 2014	Open market repurchases	$	80,000
	5.20% unsecured senior notes due February 2015		37,000
	5.25% unsecured senior notes due June 2015		140,000
			257,000
June 2011	5.45% unsecured senior notes due August 2012	Open market repurchases	7,306
	5.125% unsecured senior notes due October 2013		45,690
			52,996
February 2011	8.125% unsecured senior notes due February 2011	Scheduled maturity	13,900
Total 2011			$	323,896
December 2010	7.875% unsecured notes due February 2011	Early redemption as	85,595
	7.875% unsecured notes due July 2011	provided within indenture	132,186
	7.50% unsecured notes due January 2012	agreements	110,262
			328,043
November 2010	5.45% unsecured notes due August 2012	Open market repurchases	23,000
October 2010	4.55% unsecured notes due November 2010	Scheduled maturity	47,427
October 2010	6.25% unsecured notes due February 2013	Tender offer	162,471
	5.125% unsecured notes due October 2013		104,749
	5.25% unsecured notes due January 2014		128,077
	5.70% unsecured notes due May 2014		31,329
	5.20% unsecured notes due February 2015		47,838
	5.25% unsecured notes due June 2015		25,536
			500,000
Total 2010			$	898,470
September 2009	4.55% unsecured notes due November 2010	Tender offer	252,573
	7.875% unsecured notes due February 2011		306,905
	8.125% unsecured notes due February 2011		186,098
	7.875% unsecured notes due July 2011		341,377
	7.50% unsecured notes due January 2012		214,662
	5.45% unsecured notes due August 2012		168,301
	5.125% unsecured notes due October 2013		30,084
			1,500,000
September 2009	5.80% unsecured notes due September 2009	Scheduled maturity	210,920
July 2009	4.875% unsecured notes due July 2009	Scheduled maturity	25,413
May / June 2009	7.875% unsecured notes due July 2011	Open market repurchases	25,000
	6.25% unsecured notes due February 2013		74,785
	5.25% unsecured notes due January 2014		36,004
	5.20% unsecured notes due February 2015		57,135
			192,924
Total 2009			$	1,929,257
Total for three-year period			$	3,151,623

Schedule of Financial Services available credit lines

The following is aggregate borrowing information for our mortgage operations ($000’s omitted):

	2011				2010				2009
Available credit lines at year-end	$	2,500			$	2,500			$	175,000
Unused credit lines at year-end	$	2,500			$	2,500			$	157,000
Maximum amount outstanding at the end of any month	$	—			$	75,403			$	79,422
Average monthly indebtedness	$	—			$	17,241			$	44,522
Range of interest rates during the year:	N/A				4.25		%		0.53		%
					to				to
					4.50		%		4.75		%
Weighted-average rate at year-end	4.50		%		4.50		%		4.29		%

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