Intangible Assets, Goodwill and Other Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of expense of intangible assets	$ 10,300,000	$ 15,500,000	$ 18,700,000
Goodwill	301,959,000	301,959,000
Impairment of goodwill	0	0	$ 0
Sodium minerals and sulfur services
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 301,900,000	$ 301,900,000