Environmental Environmental (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Environmental remediation expense	$ 200,000	$ 0
Accrued environmental expense	5,500,000
Accrued environmental expense, noncurrent	3,300,000		$ 3,500,000
Affiliated Entity
Loss Contingencies [Line Items]
Accrued environmental expense	$ 400,000	$ 500,000