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Commitments: - Long-term commitments (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Coal  
Fuel:  
2017 $ 19,164
2018 10,837
2019 4,972
Nuclear Fuel  
Fuel:  
2017 46,600
2018 35,600
2019 30,500
2020 25,700
2021 30,800
Thereafter $ 60,000