Revenue (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total	$ 640,083	$ 459,105	$ 1,146,551	$ 806,607
Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	84,915	82,634	161,721	155,865
Primary nutrients
Disaggregation of Revenue [Line Items]
Total	213,604	188,463	285,263	234,153
Service
Disaggregation of Revenue [Line Items]
Total	15,216	13,611	27,903	24,215
Products and co-products
Disaggregation of Revenue [Line Items]
Total	259,211	139,117	476,843	293,981
Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	36,649	21,439	128,714	71,314
Other
Disaggregation of Revenue [Line Items]
Total	30,488	13,841	66,107	27,079
Trade
Disaggregation of Revenue [Line Items]
Total	117,748	92,470	286,187	201,184
Trade | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Trade | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Trade | Service
Disaggregation of Revenue [Line Items]
Total	2,114	2,357	3,568	4,043
Trade | Products and co-products
Disaggregation of Revenue [Line Items]
Total	74,948	63,344	146,936	116,509
Trade | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	36,649	21,439	128,714	71,314
Trade | Other
Disaggregation of Revenue [Line Items]
Total	4,037	5,330	6,969	9,318
Ethanol
Disaggregation of Revenue [Line Items]
Total	184,657	76,125	334,060	178,440
Ethanol | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Ethanol | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Ethanol | Service
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Ethanol | Products and co-products
Disaggregation of Revenue [Line Items]
Total	184,263	75,773	329,907	177,472
Ethanol | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Ethanol | Other
Disaggregation of Revenue [Line Items]
Total	394	352	4,153	968
Plant Nutrient
Disaggregation of Revenue [Line Items]
Total	321,408	279,825	490,660	404,738
Plant Nutrient | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	84,915	82,634	161,721	155,865
Plant Nutrient | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	213,604	188,463	285,263	234,153
Plant Nutrient | Service
Disaggregation of Revenue [Line Items]
Total	3,869	2,596	5,158	2,778
Plant Nutrient | Products and co-products
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Plant Nutrient | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Plant Nutrient | Other
Disaggregation of Revenue [Line Items]
Total	19,020	6,132	38,518	11,942
Rail
Disaggregation of Revenue [Line Items]
Total	16,270	10,685	35,644	22,245
Rail | Specialty nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Rail | Primary nutrients
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Rail | Service
Disaggregation of Revenue [Line Items]
Total	9,233	8,658	19,177	17,394
Rail | Products and co-products
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Rail | Frac sand and propane
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Rail | Other
Disaggregation of Revenue [Line Items]
Total	$ 7,037	$ 2,027	$ 16,467	$ 4,851