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Commitments and Contingencies (Details) - USD ($) | Sep. 30, 2015 | Jun. 15, 2015
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Long-term Purchase Commitment [Line Items] |  |
Contract Amount |  | $ 170,300,000
New Source Review [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Potential Penalty Under the Federal Clean Air Act | $ 37,500 |
Clean Power Plan [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Proposed Rate-Based Carbon Reduction | 43.00% |
Final Rate-Based Carbon Reduction | 32.00% |
Mass-Based Carbon Reduction | 24.00% |

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