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Obligations Under Investment Agreements (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments Schedule [Abstract] |
Expected Principal Payments Due Under Investment Agreements | As of December 31, 2014 and 2013, the carrying value of obligations under investment agreements, including unamortized discounts or premiums to principal, were $160,079 and $359,070, respectively. Principal due under investment agreements, based on the expected optional draw date, in each of the next five years ending December 31, and the periods thereafter, are as follows:
|  | Principal
|  | Amount
2015 |  | $ | 48,928 |
2016 |  | 5,263 |
2017 |  | 107,260 |
2018 |  | — |
2019 |  | — |
All later years |  | — |
|  | $ | 161,451 |

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