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Obligations Under Investment Agreements (Notes) | 12 Months Ended
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Dec. 31, 2014
Investments Schedule [Abstract] |
Obligations Under Investment Agreements | OBLIGATIONS UNDER INVESTMENT AGREEMENTS Certain investment agreements have contractual provisions that allow our counterparty the flexibility to withdraw funds prior to the legal maturity date. Amounts included in the table below are based on the expected optional draw date. As of December 31, 2014 and 2013, the contractual interest rates for these agreements, which include both fixed and variable, ranged from 0.25% to 6.04% and 0.23% to 6.04%, respectively. 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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