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Stockholders' Equity - Net Transfers (To) From Navient (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Transfers To and From Affiliate [Line Items] |  |  |  |
Total capital contributions |  | $ 502,581,000 |  | $ 546,081,000
Corporate push-down |  | (761,000) |  | 4,977,000
Net change in income tax accounts |  | 0 |  | 15,659,000
Net change in receivable/payable |  | (39,655,000) |  | (87,277,000)
Other |  | 0 |  | (31,000)
Total net transfers from the entity that is now a subsidiary of Navient | $ 0 | 462,165,000 | $ 0 | 479,409,000
Loan origination activities |  |  |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |  |  |
Total capital contributions |  | 7,184,000 |  | 32,452,000
Loan sales |  |  |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |  |  |
Total capital contributions |  | 0 |  | 45,000
Corporate overhead activities |  |  |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |  |  |
Total capital contributions |  | 3,461,000 |  | 21,216,000
Other |  |  |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |  |  |
Total capital contributions |  | $ 491,936,000 |  | $ 492,368,000

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