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Borrowings - Financing VIEs (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Outstanding |  |
Short Term | $ 0 | $ 0
Long Term | 2,872,231 | 2,167,979
Total | 2,872,231 | 2,167,979
Carrying Amount of Assets Securing Debt Outstanding |  |
Restricted Cash | 62,466 | 53,717
Other Assets | 45,841 | 52,153
Variable Interest Entity, Primary Beneficiary |  |
Debt Outstanding |  |
Short Term | 0 | 0
Long Term | 2,675,491 | 2,167,979
Total | 2,675,491 | 2,167,979
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 3,172,113 | 2,562,156
Restricted Cash | 57,370 | 44,617
Other Assets | 224,768 | 160,783
Total | 3,454,251 | 2,767,556
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization |  |
Debt Outstanding |  |
Short Term | 0 | 0
Long Term | 2,675,491 | 2,167,979
Total | 2,675,491 | 2,167,979
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 3,172,113 | 2,562,156
Restricted Cash | 57,370 | 44,617
Other Assets | 224,768 | 160,783
Total | 3,454,251 | 2,767,556
Variable Interest Entity, Primary Beneficiary | ABCP Facility |  |
Debt Outstanding |  |
Short Term | 0 | 0
Long Term | 0 | 0
Total | 0 | 0
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 0 | 0
Restricted Cash | 0 | 0
Other Assets | 0 | 0
Total | $ 0 | $ 0

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