Commitments and Contingencies (Details Textuals 2) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Estimated litigation liability	$ 51,200,000	$ 49,400,000
Amount of letter of credit posted as security	87,200,000
Material tax assessments	0
Helium Supply Arrangement
Loss Contingencies [Line Items]
Maximum payment in event of shortfall	46,000,000.0
Amount of letter of credit posted as security	32,800,000
Other costs associated with the settlement
Loss Contingencies [Line Items]
Estimated litigation liability	$ 5,200,000