Debt (Tables)

12 Months Ended

Dec. 31, 2014

Our debt consists of the following (in thousands):



	December 31,
	2014		2013
Debt payable to 2038 at 3.4% to 8.6% in 2014 and 2.6% to 8.6% in 2013, net	$	1,656,083	$	2,205,104
Unsecured notes payable under credit facilities	189,000		—
Debt service guaranty liability	72,105		73,740
Obligations under capital leases	21,000		21,000
Total	$	1,938,188	$	2,299,844

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,
	2014		2013
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	1,651,959	$	2,136,265
Variable-rate debt	286,229		163,579
Total	$	1,938,188	$	2,299,844
As to collateralization:
Unsecured debt	$	1,343,217	$	1,572,057
Secured debt	594,971		727,787
Total	$	1,938,188	$	2,299,844

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,
	2014			2013
Unsecured revolving credit facility:
Balance outstanding	$	189,000		$	—
Available balance	306,777			497,821
Letter of credit outstanding under facility	4,223			2,179
Variable interest rate (excluding facility fee)	0.8		%	—		%
Unsecured and uncommitted overnight facility:
Balance outstanding	$	—		$	—
Variable interest rate	—		%	—		%
Both facilities:
Maximum balance outstanding during the year	$	270,000		$	265,500
Weighted average balance	151,036			61,642
Year-to-date weighted average interest rate (excluding facility fee)	0.8		%	1.0		%

Principal Payments Of Debt

Scheduled principal payments on our debt (excluding $189.0 million unsecured notes payable under our credit facilities, $21.0 million of certain capital leases, $3.9 million fair value of interest rate contracts, $(3.1) million net premium/(discount) on debt, $4.3 million of non-cash debt-related items, and $72.1 million debt service guaranty liability) are due during the following years (in thousands):



2015	$	225,946
2016	233,152
2017	139,660
2018	59,945
2019	53,556
2020	34,990
2021	1,883
2022	304,397
2023	301,494
2024	251,588
Thereafter	44,309
Total	$	1,650,920