Debt (Tables)

9 Months Ended

Sep. 30, 2012

Our debt consists of the following (in thousands):



	September 30, 2012		December 31, 2011
Debt payable to 2038 at 2.6% to 8.8% in 2012 and 1.5% to 8.8% in 2011	$	1,881,013	$	2,268,668
Unsecured notes payable under revolving credit facilities	250,000		166,500
Debt service guaranty liability	74,075		74,075
Obligations under capital leases	21,000		21,000
Industrial revenue bonds payable to 2015 at 2.4%	1,331		1,594
Total	$	2,227,419	$	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):



	September 30, 2012		December 31, 2011
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	1,831,791	$	2,014,834
Variable-rate debt	395,628		517,003
Total	$	2,227,419	$	2,531,837
As to collateralization:
Unsecured debt	$	1,254,804	$	1,510,932
Secured debt	972,615		1,020,905
Total	$	2,227,419	$	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):



	September 30, 2012			December 31, 2011
Unsecured revolving credit facility:
Balance outstanding	$	250,000		$	145,000
Available balance	247,571			351,571
Letter of credit outstanding under facility	2,429			3,429
Variable interest rate (excluding facility fee)	1.2		%	1.3		%
Unsecured and uncommitted overnight facility:
Balance outstanding	$	—		$	21,500
Variable interest rate	—		%	1.5		%
Both facilities:
Maximum balance outstanding during the year	$	303,100		$	330,700
Weighted average balance	194,410			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 $250.0 million due under our revolving credit facilities, $21.0 million of certain capital leases, $10.8 million fair value of interest rate contracts, $2.9 million net premium/(discount) on debt, $12.3 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 (1)	$	127,624
2013	315,520
2014	474,292
2015	275,999
2016	231,661
2017	142,096
2018	64,441
2019 (2)	153,724
2020	3,746
2021	2,763
Thereafter	64,470
Total	$	1,856,336

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(1)	Includes $54.1 million of our 3.95% convertible senior unsecured notes outstanding due 2026, which were called by us with a redemption date of November 8, 2012.


(2)	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.