Debt (Tables)

6 Months Ended

Jun. 30, 2012

Long-term Debt, Unclassified [Abstract]

Our debt consists of the following (in thousands):



	June 30, 2012		December 31, 2011
Debt payable to 2038 at 2.6% to 8.8%	$	1,869,191	$	2,268,668
Debt service guaranty liability	74,075		74,075
Unsecured notes payable under revolving credit facilities	229,000		166,500
Obligations under capital leases	21,000		21,000
Industrial revenue bonds payable to 2015 at 2.4%	1,419		1,594
Total	$	2,194,685	$	2,531,837

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

The grouping of total debt between fixed and variable-rate as well as between secured and unsecured is summarized below (in thousands):



	June 30, 2012		December 31, 2011
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	1,819,541	$	2,014,834
Variable-rate debt	375,144		517,003
Total	$	2,194,685	$	2,531,837
As to collateralization:
Unsecured debt	$	1,257,125	$	1,510,932
Secured debt	937,560		1,020,905
Total	$	2,194,685	$	2,531,837

Revolving Credit Facilities

The following table discloses certain information regarding our unsecured notes payable under our revolving credit facilities (in thousands, except percentages):



	June 30, 2012			December 31, 2011
Unsecured revolving credit facility:
Balance outstanding	$	170,000		$	145,000
Available balance	326,571			351,571
Letter of credit outstanding under facility	3,429			3,429
Variable interest rate (excluding facility fee)	1.2		%	1.3		%
Unsecured and uncommitted overnight facility:
Balance outstanding	$	59,000		$	21,500
Variable interest rate	1.5		%	1.5		%
Both facilities:
Maximum balance outstanding during the year	$	281,700		$	330,700
Weighted average balance	169,746			151,814
Year-to-date weighted average interest rate (excluding facility fee)	1.3		%	1.5		%

Principal Payments Of Debt

Scheduled principal payments on our debt (excluding $229.0 million due under our revolving credit facilities, $21.0 million of certain capital leases, $10.8 million fair value of interest rate contracts, $1.6 million net premium/(discount) on debt, $9.6 million of non-cash debt-related items, and $74.1 million debt service guaranty liability) are due during the following years (in thousands):



2012 remaining	$	103,354
2013	315,056
2014	473,804
2015	239,346
2016	231,661
2017	142,096
2018	64,441
2019 (1)	153,724
2020	3,746
2021	2,763
Thereafter (2)	118,575
Total	$	1,848,566

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(1)	Includes $100.0 million of our 8.1% senior unsecured notes due 2019 which may be redeemed by us at any time on or after September 2014 at our option.


(2)	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.