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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Debt With Contractual Term Less Than One Year | Debt with a contractual term less than one year is generally classified as short-term debt and consisted of the following as of December 31 (in thousands):
|  | 2017 |  | 2016
Unsecured commercial paper |  | $ | 1,273,482 |  |  | $ | 1,055,708 |
Total short-term debt |  | $ | 1,273,482 |  |  | $ | 1,055,708 |
Debt With A Contractual Term Greater Than One Year | 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):
|  | 2017 |  | 2016
Secured debt (Note 10) |  |  |  |
Asset-backed Canadian commercial paper conduit facility |  | $ | 174,779 |  |  | $ | 149,338 |
Asset-backed U.S. commercial paper conduit facilities |  | 279,457 |  |  | — |
Asset-backed securitization debt |  | 353,085 |  |  | 797,755 |
Less: unamortized discount and debt issuance costs |  | (461 | ) |  | (1,480 | )
Total secured debt |  | 806,860 |  |  | 945,613 |
Unsecured notes (at par value) |  |  |  |
2.70% Medium-term notes due in 2017, issued January 2012 |  | — |  |  | 400,000 |
1.55% Medium-term notes due in 2017, issued November 2014 |  | — |  |  | 400,000 |
6.80% Medium-term notes due in 2018, issued May 2008 |  | 877,488 |  |  | 877,488 |
2.25% Medium-term notes due in 2019, issued January 2016 |  | 600,000 |  |  | 600,000 |
Floating-rate Medium-term notes due in 2019, issued March 2017(a) |  | 150,000 |  |  | — |
2.40% Medium-term notes due in 2019, issued September 2014 |  | 600,000 |  |  | 600,000 |
2.15% Medium-term notes due in 2020, issued February 2015 |  | 600,000 |  |  | 600,000 |
2.40% Medium-term notes due in 2020, issued March 2017 |  | 350,000 |  |  | — |
2.85% Medium-term notes due in 2021, issued January 2016 |  | 600,000 |  |  | 600,000 |
2.55% Medium-term notes due in 2022, issued June 2017 |  | 400,000 |  |  | — |
3.50% Senior unsecured notes due in 2025, issued July 2015 |  | 450,000 |  |  | 450,000 |
4.625% Senior unsecured notes due in 2045, issued July 2015 |  | 300,000 |  |  | 300,000 |
Less: unamortized discount and debt issuance costs |  | (19,821 | ) |  | (21,242 | )
Gross long-term debt |  | 5,714,527 |  |  | 5,751,859 |
Less: current portion of long-term debt, net of unamortized discount and issuance costs |  | (1,127,269 | ) |  | (1,084,884 | )
Total long-term debt |  | $ | 4,587,258 |  |  | $ | 4,666,975 |
At December 31, 2017, 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
In addition, outstanding balances related to the following secured notes included in the Company's consolidated balance sheet at December 31, 2016 were repaid during 2017 (in thousands):
| Issue Date |  | Principal Amount at Date of Issuance |  | Weighted-Average Rate at Date of Issuance |  | Contractual Maturity Date
| April 2013 |  | $650,000 |  | 0.57% |  | May 2014 - December 2020
Schedule of Maturities of Long-term Debt | A summary of the Company’s expected principal payments for debt obligations as of December 31, 2017 is as follows (in thousands):
2018 |  | $ | 2,405,569 |
2019 |  | 1,594,518 |
2020 |  | 1,098,489 |
2021 |  | 721,705 |
2022 |  | 438,010 |
Thereafter |  | 750,000 |
Total |  | $ | 7,008,291 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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