Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Schedule Of Debt

Our debt consists of the following (in thousands):

	March 31, 2013		December 31, 2012
Debt payable to 2038 at 2.6% to 8.6% in 2013 and 2.6% to 8.8% in 2012	$	2,227,395	$	2,041,709
Unsecured notes payable under credit facilities	—		66,000
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%	1,150		1,246
Total	$	2,323,620	$	2,204,030

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):

	March 31, 2013		December 31, 2012
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	2,179,715	$	1,992,599
Variable-rate debt	143,905		211,431
Total	$	2,323,620	$	2,204,030
As to collateralization:
Unsecured debt	$	1,438,838	$	1,270,742
Secured debt	884,782		933,288
Total	$	2,323,620	$	2,204,030

Schedule Of Credit Facilities

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

	March 31, 2013			December 31, 2012
Unsecured revolving credit facility:
Balance outstanding	$	—		$	30,000
Available balance	497,571			467,571
Letter of credit outstanding under facility	2,429			2,429
Variable interest rate (excluding facility fee)	—		%	1.1		%
Unsecured and uncommitted overnight facility:
Balance outstanding	$	—		$	36,000
Variable interest rate	—		%	1.5		%
Both facilities:
Maximum balance outstanding during the period	$	265,500		$	303,100
Weighted average balance	114,956			157,447
Year-to-date weighted average interest rate (excluding facility fee)	1.1		%	1.3		%

Principal Payments Of Debt

Scheduled principal payments on our debt (excluding $21.0 million of certain capital leases, $8.9 million fair value of interest rate contracts, $(2.5) million net premium/(discount) on debt, $1.5 million of non-cash debt-related items, and $74.1 million debt service guaranty liability) are due during the following years (in thousands):

2013 remaining	$	247,465
2014	473,103
2015	274,707
2016	223,198
2017	140,830
2018	63,057
2019 (1)	152,211
2020	2,099
2021	957
2022	303,410
Thereafter	339,312
Total	$	2,220,349

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(1) Includes $100 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.