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Borrowings - Financing VIEs (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Debt Outstanding |  |  |
Short Term | $ 297,800 | $ 0 |
Long Term | 4,601,888 | 4,284,304 |
Total | 4,899,688 | 4,284,304 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Restricted Cash | 142,846 | 122,789 | $ 115,658
Other Assets | 40,324 | 48,141 |
Variable Interest Entity, Primary Beneficiary |  |  |
Debt Outstanding |  |  |
Short Term | 297,800 | 0 |
Long Term | 4,403,932 | 4,086,956 |
Total | 4,701,732 | 4,086,956 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 5,786,175 | 5,030,837 |
Restricted Cash | 135,945 | 113,431 |
Other Assets | 427,733 | 326,727 |
Total | 6,349,853 | 5,470,995 |
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 4,403,932 | 4,086,956 |
Total | 4,403,932 | 4,086,956 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 5,446,885 | 5,030,837 |
Restricted Cash | 127,043 | 113,431 |
Other Assets | 400,574 | 326,570 |
Total | 5,974,502 | 5,470,838 |
Variable Interest Entity, Primary Beneficiary | Secured Borrowing Facility |  |  |
Debt Outstanding |  |  |
Short Term | 297,800 | 0 |
Long Term | 0 | 0 |
Total | 297,800 | 0 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 339,290 | 0 |
Restricted Cash | 8,902 | 0 |
Other Assets | 27,159 | 157 |
Total | $ 375,351 | $ 157 |

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