Commitments and Contingencies Disclosure (Changes in Environmental Liability) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at Beginning of the Period	$ 10,010	$ 9,083	$ 4,979
Additions to Accrual	0	1,576	5,600
Expenditures for Remediation	(112)	(649)	(1,496)
Balance at Period-end	$ 9,898	$ 10,010	$ 9,083