Debt (Tables)

9 Months Ended

Sep. 30, 2011

Debt [Abstract]

Schedule Of Debt

	September 30, 2011		December 31, 2010
Debt payable to 2038 at 1.5% to 8.8%	$	2,289,305	$	2,389,532
Debt service guaranty liability		74,075		97,000
Unsecured notes payable under revolving credit facilities		195,300		80,000
Obligations under capital leases		45,383		21,000
Industrial revenue bonds payable to 2015 at 2.4%		1,674		1,916
Total	$	2,605,737	$	2,589,448

Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured

	September 30, 2011		December 31, 2010
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	2,059,010	$	2,349,802
Variable-rate debt		546,727		239,646
Total	$	2,605,737	$	2,589,448
As to collateralization:
Unsecured debt	$	1,540,882	$	1,450,148
Secured debt		1,064,855		1,139,300
Total	$	2,605,737	$	2,589,448

Principal Payments Of Debt

2011 remaining	$               8,109
2012	507,195
2013	315,094
2014	473,863
2015	245,603
2016	231,311
2017	142,119
2018	64,411
2019	153,747
2020	3,658
Thereafter (1)	121,129
Total	$        2,266,239

(1) Includes $54.1 million of our 3.95% convertible senior unsecured notes outstanding due 2026, which may be called by us at any time and have future put options in 2016 and 2021.