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Commitment and Contingencies - Future Minimum Contractual Commitments under Non-cancelable Agreements (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 2,381
2018 2,304
2019 2,270
2020 1,647
2021 680
Gas Contract [Member]  
Operating Leased Assets [Line Items]  
2017 1,643
2018 1,643
2019 1,643
2020 1,647
2021 680
Office Leases [Member]  
Operating Leased Assets [Line Items]  
2017 738
2018 661
2019 $ 627