Commitments and Contingencies Commitments and Contingencies (Other Matters) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
TexStar Contract Period Term			20 years
TexStar Current Liability	$ 38,100,000		$ 38,100,000
Minimum
Loss Contingencies [Line Items]
TexStar Potential Payments	0.0		0.0
Maximum
Loss Contingencies [Line Items]
TexStar Potential Payments	500,000		500,000
Shreveport
Loss Contingencies [Line Items]
Litigation Settlement, Expense			$ 3,700,000
Corporation
Loss Contingencies [Line Items]
Litigation Settlement, Expense	$ 300,000
TexStar
Loss Contingencies [Line Items]
Loss on Disposition of Assets		$ 10,700,000