Intangible Assets, Goodwill and Other Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Amortization of expense of intangible assets	$ 10,300,000	$ 10,400,000	$ 10,100,000
Impairment of intangible assets		43,000,000.0
Goodwill	301,959,000	301,959,000
Impairment of goodwill	0	$ 0	0
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]		Impairment expense
Liability for uncertain tax positions		$ 0	$ 0
Sodium Minerals and Sulfur Services Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 302,000,000.0	$ 302,000,000.0