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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Short Term | $ 0 | $ 0
Long Term | 4,217,119 | 3,275,270
Total | 4,217,119 | 3,275,270
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 196,943 | 196,539
Total | 196,943 | 196,539
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 4,020,176 | 3,078,731
Total | 4,020,176 | 3,078,731
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 4,020,176 | 3,078,731
Total | 4,020,176 | 3,078,731
Secured borrowings | Private Education Loan securitization | Fixed rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 2,125,035 | 1,565,760
Total | 2,125,035 | 1,565,760
Secured borrowings | Private Education Loan securitization | Variable rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 1,895,141 | 1,512,971
Total | 1,895,141 | 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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