Debt (Tables)

6 Months Ended

Jun. 30, 2011

Debt

Schedule Of Debt

	June 30, 2011		December 31, 2010
Debt payable to 2038 at 2.6% to 8.8%	$	2,316,914	$	2,389,532
Debt service guaranty liability		74,075		97,000
Unsecured notes payable under revolving credit facilities		177,850		80,000
Obligations under capital leases		45,383		21,000
Industrial revenue bonds payable to 2015 at 2.4%		1,754		1,916
Total	$	2,615,976	$	2,589,448

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

	June 30, 2011		December 31, 2010
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	2,289,738	$	2,349,802
Variable-rate debt		326,238		239,646
Total	$	2,615,976	$	2,589,448
As to collateralization:
Unsecured debt	$	1,525,239	$	1,450,148
Secured debt		1,090,737		1,139,300
Total	$	2,615,976	$	2,589,448

Principal Payments Of Debt

2011 remaining	$	161,171
2012		307,228
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)		198,291
Total	$	2,296,496

(1) Includes $131.3 million of our 3.95% convertible senior unsecured notes outstanding due 2026, of which $77.2 million have been redeemed on August 1, 2011.