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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Short Term | $ 300,000 | $ 0
Long Term | 2,738,662 | 2,167,979
Total | 3,038,662 | 2,167,979
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 196,337 | 0
Total | 196,337 | 0
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 300,000 | 0
Long Term | 2,542,325 | 2,167,979
Total | 2,842,325 | 2,167,979
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 2,542,325 | 2,167,979
Total | 2,542,325 | 2,167,979
Secured borrowings | ABCP borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 300,000 | 0
Long Term | 0 | 0
Total | $ 300,000 | $ 0

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