Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill at beginning of period	$ 127,856	$ 129,342	$ 129,342
Disposals		(800)
Acquisitions	0		0
Impairments		(686)
Goodwill at end of period	127,856	127,856	129,342
Trade
Goodwill [Roll Forward]
Goodwill at beginning of period	119,067	119,867	119,867
Disposals		(800)
Acquisitions	0		0
Impairments		0
Goodwill at end of period	119,067	119,067	119,867
Renewables
Goodwill [Roll Forward]
Goodwill at beginning of period	8,789	8,789	8,789
Disposals		0
Acquisitions	0		0
Impairments		0
Goodwill at end of period	8,789	8,789	8,789
Nutrient & Industrial
Goodwill [Roll Forward]
Goodwill at beginning of period	0	686	686
Disposals		0
Acquisitions	0		0
Impairments		(686)
Goodwill at end of period	$ 0	$ 0	$ 686