Annual report pursuant to Section 13 and 15(d)

Commitments - Schedule of Firm Sales Contracted with Third Parties (Details)

v3.6.0.2
Commitments - Schedule of Firm Sales Contracted with Third Parties (Details)
MMBTU / d in Thousands
Dec. 31, 2016
MMBTU / d
Commitments and Contingencies Disclosure [Abstract]  
2017 516
2018 257
2019 226
2020 223
2021 126
Thereafter 31
Total 1,379