Commitments And Contingencies (Firm Transportation Contracts) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 12,236
2020	12,236
2021	12,236
2022	12,236
2023	12,236
Thereafter	25,023
Firm Transportation Contracts	$ 86,203