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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Document Period End Date | Sep. 30, 2018 |
Short Term | $ 0 | $ 0
Long Term | 4,532,221 | 3,275,270
Total | 4,532,221 | 3,275,270
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 197,146 | 196,539
Total | 197,146 | 196,539
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 4,335,075 | 3,078,731
Total | 4,335,075 | 3,078,731
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 4,335,075 | 3,078,731
Total | 4,335,075 | 3,078,731
Secured borrowings | Private Education Loan securitization | Fixed rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 2,337,004 | 1,565,760
Total | 2,337,004 | 1,565,760
Secured borrowings | Private Education Loan securitization | Variable rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 1,998,071 | 1,512,971
Total | 1,998,071 | 1,512,971
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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