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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Short Term | $ 0 | $ 0
Long Term | 3,744,345 | 3,275,270
Total | 3,744,345 | 3,275,270
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 196,741 | 196,539
Total | 196,741 | 196,539
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 3,547,604 | 3,078,731
Total | 3,547,604 | 3,078,731
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 3,547,604 | 3,078,731
Total | 3,547,604 | 3,078,731
Secured borrowings | ABCP Facility |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 0 | 0
Total | $ 0 | $ 0

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + Details
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