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Obligations Under Investment Agreements (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments Schedule [Abstract] |
Expected Principal Payments Due Under Investment Agreements | spectively. As of December 31, 2015 and 2014, the contractual interest rates for these agreements, which include both fixed and variable, ranged from 0.43% to 0.43% and 0.25% to 6.04%, respectively. Principal due under investment agreements, based on the legal maturity dates, in each of the next five years ending December 31, and the periods thereafter, are as follows:
2016 |  | $ | — |
2017 |  | 100,358 |
2018 |  | — |
2019 |  | — |
2020 |  | — |
All later years |  | — |
|  | $ | 100,358 |

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