Commitments and Contingencies Commitments And Contingencies - Gross Future Minimum Volume Charges (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Commitments and Contingencies - Gross Future Minimum Volume Charges [Abstract]
2019	$ 2,291
2020	3,895
2021	1,997
Thereafter	0
Total	$ 8,183