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Borrowings - Financing VIEs (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Debt Outstanding |  |  |
Short Term | $ 0 | $ 0 |
Long Term | 4,217,119 | 3,275,270 |
Total | 4,217,119 | 3,275,270 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Restricted Cash | 114,659 | 101,836 | $ 62,466
Other Assets | 99,651 | 84,853 |
Variable Interest Entity, Primary Beneficiary |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 4,020,176 | 3,078,731 |
Total | 4,020,176 | 3,078,731 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 4,793,290 | 3,691,024 |
Restricted Cash | 105,963 | 96,983 |
Other Assets | 335,039 | 240,369 |
Total | 5,234,292 | 4,028,376 |
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 4,020,176 | 3,078,731 |
Total | 4,020,176 | 3,078,731 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 4,793,290 | 3,691,024 |
Restricted Cash | 105,963 | 95,966 |
Other Assets | 334,333 | 240,208 |
Total | 5,233,586 | 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 | 0 | 1,017 |
Other Assets | 706 | 161 |
Total | $ 706 | $ 1,178 |

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