Annual report pursuant to Section 13 and 15(d)

Commitments - Schedule of Firm Transportation Contracts (Details)

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Commitments - Schedule of Firm Transportation Contracts (Details) - Transportation commitment
MMBTU in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
MMBTU
Transportation Volume [Abstract]  
2020 (MMBtu) | MMBTU 505,080
2021 (MMBtu) | MMBTU 531,075
2022 (MMBtu) | MMBTU 531,075
2023 (MMBtu) | MMBTU 515,867
2024 (MMBtu) | MMBTU 489,525
Thereafter (MMBtu) | MMBTU 3,778,217
Total (MMBtu) | MMBTU 6,350,839
Transportation [Abstract]  
2020 | $ $ 274,813
2021 | $ 286,626
2022 | $ 286,626
2023 | $ 282,945
2024 | $ 265,568
Thereafter | $ 2,163,926
Total | $ $ 3,560,504