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Commitments Purchase Commitments (Details) MMBTU / d in Thousands | Dec. 31, 2015 MMBTU / d
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Other Commitments [Line Items] |
Sales Commitment, Volume | 1,452
2016 |
Other Commitments [Line Items] |
Sales Commitment, Volume | 476
2017 |
Other Commitments [Line Items] |
Sales Commitment, Volume | 349
2018 |
Other Commitments [Line Items] |
Sales Commitment, Volume | 216
2019 |
Other Commitments [Line Items] |
Sales Commitment, Volume | 197
2020 |
Other Commitments [Line Items] |
Sales Commitment, Volume | 152
Thereafter |
Other Commitments [Line Items] |
Sales Commitment, Volume | 62

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