Debt (Tables)

6 Months Ended

Jun. 30, 2013

Our debt consists of the following (in thousands):



	June 30, 2013		December 31, 2012
Debt payable to 2038 at 2.6% to 8.6% in 2013 and 2.6% to 8.8% in 2012	$	2,150,132	$	2,041,709
Unsecured notes payable under credit facilities	104,500		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%	1,055		1,246
Total	$	2,350,762	$	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):



	June 30, 2013		December 31, 2012
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	2,103,023	$	1,992,599
Variable-rate debt	247,739		211,431
Total	$	2,350,762	$	2,204,030
As to collateralization:
Unsecured debt	$	1,540,756	$	1,270,742
Secured debt	810,006		933,288
Total	$	2,350,762	$	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):



	June 30, 2013			December 31, 2012
Unsecured revolving credit facility:
Balance outstanding	$	80,000		$	30,000
Available balance	418,821			467,571
Letter of credit outstanding under facility	1,179			2,429
Variable interest rate (excluding facility fee)	1.0		%	1.1		%
Unsecured and uncommitted overnight facility:
Balance outstanding	$	24,500		$	36,000
Variable interest rate	1.5		%	1.5		%
Both facilities:
Maximum balance outstanding during the period	$	265,500		$	303,100
Weighted average balance	77,094			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 $104.5 million due under our credit facilities, $21.0 million of certain capital leases, $6.8 million fair value of interest rate contracts, $(2.4) million net premium/(discount) on debt, $3.1 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	$	149,879
2014	474,020
2015	275,678
2016	226,027
2017	141,864
2018	64,157
2019 ⁽¹⁾	153,380
2020	3,342
2021	2,278
2022	304,815
Thereafter	348,264
Total	$	2,143,704

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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.