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Basis of Presentation and Summary of Significant Accounting Policies - Natural Gas Imbalances (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Other Current Assets |  |
Gas Balance Arrangements [Line Items] |  |
Gas balancing receivable (payable) | $ 0.9 | $ 0.7
Other Current Liabilities |  |
Gas Balance Arrangements [Line Items] |  |
Gas balancing receivable (payable) | $ (0.1) | $ (0.3)

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- Definition [Line Items] for Gas Balance Arrangements [Table] + References No definition available. + Details
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- Definition The value of gas balancing asset or liability as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e512571-122862 + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |