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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Commitments [Line Items] |
Schedule of Long-term Purchase Commitments | The table below presents these commitments at December 31, 2017 as follows:
| (MMBtu per day)
2018 | 560,800 |
2019 | 659,000 |
2020 | 526,000 |
2021 | 372,000 |
2022 | 272,000 |
Thereafter | 240,000 |
Total | 2,629,800 |
Schedule of Future Minimum Lease Commitments | Future minimum lease commitments under these leases at December 31, 2017 are as follows:
| (In thousands)
2018 | $ | 136 |
2019 | 54 |
Total | $ | 190 |
Schedule of Rent Expense | Presented below is rent expense for the years ended December 31, 2017, 2016 and 2015, respectively.
| For the years ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Minimum rentals | $ | 343 |  |  | $ | 840 |  |  | $ | 759 |
Less: Sublease rentals | — |  |  | — |  |  | 8 |
| $ | 343 |  |  | $ | 840 |  |  | $ | 751 |
Transportation commitment |
Other Commitments [Line Items] |
Schedule of Future Service Commitments | The table below presents these commitments at December 31, 2017 as follows:
| (In thousands)
2018 | $ | 248,047 |
2019 | 251,644 |
2020 | 247,581 |
2021 | 246,620 |
2022 | 246,620 |
Thereafter | 2,511,853 |
Total | $ | 3,752,365 |
Purchase commitments |
Other Commitments [Line Items] |
Schedule of Future Service Commitments | Future minimum commitments under these agreements at December 31, 2017 are as follows:
| (In thousands)
2018 | $ | 39,330 |
Total | $ | 39,330 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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