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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Short Term | $ 350,000 | $ 500,175
Long Term | 1,577,689 | 579,101
Total | 1,927,689 | 1,079,276
Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 1,577,689 | 579,101
Total | 1,577,689 | 579,101
ABCP borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 350,000 | 500,175
Long Term | 0 | 0
Total | $ 350,000 | $ 500,175

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