Debt (Tables)

3 Months Ended

Mar. 31, 2016

Our debt consists of the following (in thousands):



	March 31, 2016		December 31, 2015
Debt payable, net to 2038 ⁽¹⁾	$	1,918,489	$	1,872,942
Unsecured notes payable under credit facilities	180,000		149,500
Debt service guaranty liability	69,835		69,835
Obligations under capital leases	21,000		21,000
Total	$	2,189,324	$	2,113,277

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(1)	At March 31, 2016, interest rates ranged from 1.7% to 8.6% at a weighted average rate of 4.3%. At December 31, 2015, interest rates ranged from 1.0% to 8.6% at a weighted average rate of 4.3%.

Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured

The allocation of total debt between fixed and variable-rate as well as between secured and unsecured is summarized below (in thousands):



	March 31, 2016		December 31, 2015
As to interest rate (including the effects of interest rate contracts):
Fixed-rate debt	$	1,915,829	$	1,869,683
Variable-rate debt	273,495		243,594
Total	$	2,189,324	$	2,113,277
As to collateralization:
Unsecured debt	$	1,681,507	$	1,650,521
Secured debt	507,817		462,756
Total	$	2,189,324	$	2,113,277

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, 2016			December 31, 2015
Unsecured revolving credit facility:
Balance outstanding	$	180,000		$	140,000
Available balance	315,190			355,190
Letters of credit outstanding under facility	4,810			4,810
Variable interest rate (excluding facility fee)	1.3		%	1.3		%
Unsecured short-term facility:
Balance outstanding	$	—		$	9,500
Variable interest rate (excluding facility fee)	—		%	1.7		%
Both facilities:
Maximum balance outstanding during the period	$	200,000		$	244,500
Weighted average balance	147,446			100,506
Year-to-date weighted average interest rate (excluding facility fee)	1.3		%	0.9		%

Principal Payments Of Debt

Scheduled principal payments on our debt (excluding $180.0 million unsecured notes payable under our credit facilities, $21.0 million of certain capital leases, $2.6 million fair value of interest rate contracts, $(4.4) million net premium/(discount) on debt, $(9.5) million of deferred debt costs, $5.9 million of non-cash debt-related items, and $69.8 million debt service guaranty liability) are due during the following years (in thousands):



2016 remaining	$	158,492
2017	175,159
2018	62,538
2019	56,245
2020	237,779
2021	17,667
2022	307,011
2023	304,202
2024	254,394
2025	301,672
Thereafter	48,893
Total	$	1,924,052