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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Short Term | $ 297,800 | $ 0
Long Term | 4,601,888 | 4,284,304
Total | 4,899,688 | 4,284,304
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 197,956 | 197,348
Total | 197,956 | 197,348
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short Term | 297,800 | 0
Long Term | 4,403,932 | 4,086,956
Total | 4,701,732 | 4,086,956
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 4,403,932 | 4,086,956
Total | 4,403,932 | 4,086,956
Secured borrowings | Private Education Loan securitization | Fixed-rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 2,699,378 | 2,284,347
Total | 2,699,378 | 2,284,347
Secured borrowings | Private Education Loan securitization | Variable-rate |  |
Debt Instrument [Line Items] |  |
Short Term | 0 | 0
Long Term | 1,704,554 | 1,802,609
Total | 1,704,554 | 1,802,609
Secured borrowings | Secured Borrowing Facility |  |
Debt Instrument [Line Items] |  |
Short Term | 297,800 | 0
Long Term | 0 | 0
Total | $ 297,800 | $ 0

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