Debt (Tables)

12 Months Ended

Dec. 31, 2013

Our debt consists of the following (in thousands):



	December 31,
	2013		2012
Debt payable to 2038 at 2.6% to 8.6% in 2013 and 2.6% to 8.8% in 2012	$	2,205,104	$	2,041,709
Unsecured notes payable under credit facilities	—		66,000
Debt service guaranty liability	73,740		74,075
Obligations under capital leases	21,000		21,000
Industrial revenue bonds payable at 2.4% in 2012	—		1,246
Total	$	2,299,844	$	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):



	December 31,
	2013		2012
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	2,136,265	$	1,992,599
Variable-rate debt	163,579		211,431
Total	$	2,299,844	$	2,204,030
As to collateralization:
Unsecured debt	$	1,572,057	$	1,270,742
Secured debt	727,787		933,288
Total	$	2,299,844	$	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):



	December 31,
	2013			2012
Unsecured revolving credit facility:
Balance outstanding	$	—		$	30,000
Available balance	497,821			467,571
Letter of credit outstanding under facility	2,179			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 year	$	265,500		$	303,100
Weighted average balance	61,642			157,447
Year-to-date weighted average interest rate (excluding facility fee)	1.0		%	1.3		%

Principal Payments Of Debt

Scheduled principal payments on our debt (excluding $21.0 million of certain capital leases, $5.4 million fair value of interest rate contracts, $(3.3) million net premium/(discount) on debt, $6.5 million of non-cash debt-related items, and $73.7 million debt service guaranty liability) are due during the following years (in thousands):



2014	$	368,858
2015	276,346
2016	249,723
2017	142,332
2018	64,653
2019 ⁽¹⁾	153,907
2020	35,363
2021	2,278
2022	304,815
2023	301,937
Thereafter	296,327
Total	$	2,196,539

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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.