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Borrowings - Financing VIEs (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Outstanding |  |
Short Term | $ 0 | $ 0
Long Term | 3,744,345 | 3,275,270
Total | 3,744,345 | 3,275,270
Carrying Amount of Assets Securing Debt Outstanding |  |
Restricted Cash | 120,084 | 101,836
Other Assets | 93,332 | 84,853
Variable Interest Entity, Primary Beneficiary |  |
Debt Outstanding |  |
Short Term | 0 | 0
Long Term | 3,547,604 | 3,078,731
Total | 3,547,604 | 3,078,731
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 4,243,820 | 3,691,024
Restricted Cash | 115,009 | 96,983
Other Assets | 290,530 | 240,369
Total | 4,649,359 | 4,028,376
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization |  |
Debt Outstanding |  |
Short Term | 0 | 0
Long Term | 3,547,604 | 3,078,731
Total | 3,547,604 | 3,078,731
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 4,243,820 | 3,691,024
Restricted Cash | 106,351 | 95,966
Other Assets | 280,646 | 240,208
Total | 4,630,817 | 4,027,198
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 | 8,658 | 1,017
Other Assets | 9,884 | 161
Total | $ 18,542 | $ 1,178

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