Notes (Tables)

12 Months Ended

Dec. 31, 2010

Notes (Tables) [Abstract]

Summary of Company's unsecured note balances and certain interest rate and maturity date information

December 31, 2010 (Amounts are in thousands)	Net Principal Balance		Interest Rate Ranges	Weighted Average Interest Rate	Maturity Date Ranges
Fixed Rate Public/Private Notes (1)		$ 4,375,860	3.85% - 7.57%	5.78%	2011 - 2026
Floating Rate Public/Private Notes (1)		809,320	(1)	1.72%	2011 - 2013
Totals	$	5,185,180
December 31, 2009 (Amounts are in thousands)	Net Principal Balance		Interest Rate Ranges	Weighted Average Interest Rate	Maturity Date Ranges
Fixed Rate Public/Private Notes (1)		$ 3,771,700	3.85% - 7.57%	5.93%	2011 - 2026
Floating Rate Public/Private Notes (1)		801,824	(1)	1.37%	2010 - 2013
Floating Rate Tax-Exempt Bonds		35,600	(2)	0.37%	2028
Totals	$	4,609,124

(1) At December 31, 2010 and 2009, $300.0 million in fair value interest rate swaps converts a portion of the $400.0 million face value 5.200% notes due April 1, 2013 to a floating interest rate.

(2) The floating interest rate is based on the 7-Day Securities Industry and Financial Markets Association (“SIFMA”) rate, which is the tax-exempt index equivalent of LIBOR. The interest rate is 0.27% at December 31, 2009.

Aggregate payments of principal on unsecured notes payable

Year	Total (1)
2011(2)(3)	$	1,068,891
2012		474,221
2013		407,849
2014		498,576
2015		298,700
Thereafter		2,436,943
Total	$	5,185,180

(1) Principal payments on unsecured notes include amortization of any discounts or premiums related to the notes. Premiums and discounts are amortized over the life of the unsecured notes.

(2) Includes the Company’s $500.0 million term loan facility, which originally matured on October 5, 2010. Effective April 12, 2010, the Company exercised the first of its two one-year extension options. As a result, the maturity date is now October 5, 2011 and there is one remaining one-year extension option exercisable by the Company.

(3) Includes $482.5 million face value of 3.85% convertible unsecured debt with a final maturity of 2026.