Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Debt With Contractual Term Less Than One Year

Debt with contractual terms less than one year is generally classified as short-term debt and consisted of the following as of December 31 (in thousands):

	2015		2014
Unsecured commercial paper	$	1,201,380	$	731,786

Debt With A Contractual Term Greater Than One Year

Outstanding balances related to the following secured notes were included in the Company's consolidated balance sheet at December 31, 2014 and the Company completed repayment of those balances during 2015 (in thousands):

Issue Date	Principal Amount at Date of Issuance	Weighted-Average Rate at Date of Issuance	Contractual Maturity Date
November 2011	$513,300	0.88%	November 2012 - February 2018
August 2011	$573,380	0.76%	September 2012 - August 2017

At December 31, 2015, the Company's consolidated balance sheet included outstanding balances related to the following secured notes with the related maturity dates and interest rates (in thousands):

Issue Date	Principal Amount at Date of Issuance	Weighted-Average Rate at Date of Issuance	Contractual Maturity Date
May 2015	$500,000	0.88%	May 2016 - December 2022
January 2015	$700,000	0.89%	February 2016 - August 2022
April 2014	$850,000	0.66%	April 2015 - October 2021
April 2013	$650,000	0.57%	May 2014 - December 2020
July 2012	$675,306	0.59%	August 2013 - June 2018

Debt with a contractual term greater than one year is generally classified as long-term debt and consisted of the following as of December 31 (in thousands):

	2015			2014
Secured debt
Asset-backed Canadian commercial paper conduit facility	$	153,839		$	166,912
Term asset-backed securitization debt	1,463,154			1,271,533
Unsecured notes
1.15% Medium-term notes due in 2015 ($600.0 million par value)	—			599,817
3.88% Medium-term notes due in 2016 ($450.0 million par value)	449,991			449,937
2.70% Medium-term notes due in 2017 ($400.0 million par value)	399,980			399,963
1.55% Medium-term notes due in 2017 ($400.0 million par value)	399,650			399,464
6.80% Medium-term notes due in 2018 ($879.0 million par value)	878,308			887,381
2.40% Medium-term notes due in 2019 ($600.0 million par value)	598,296			597,836
2.15% Medium-term notes due in 2020 ($600.0 million par value)	598,856			—
3.50% Senior unsecured notes due in 2025 ($450.0 million par value)	447,608			—
4.625% Senior unsecured notes due in 2045 ($300.0 million par value)	299,326			—
Gross long-term debt	5,689,008			4,772,843
Less: current portion of long-term debt	(843,620		)	(1,011,315		)
Long-term debt	$	4,845,388		$	3,761,528

Schedule of Maturities of Long-term Debt [Table Text Block]

A summary of the Company’s expected principal payments for debt obligations as of December 31, 2015 is as follows (in thousands):

	2016		2017		2018		2019		2020		Thereafter		Total
Principal payments on debt	$	2,045,000	$	1,177,493	$	1,303,698	$	934,386	$	682,877	$	746,934	$	6,890,388