Property, Plant and Equipment, Net (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 630,632	$ 582,502
Accumulated depreciation and depletion	(320,638)	(287,542)
Property, plant and equipment, net	309,994	294,960
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	461,742	422,071
Buildings, Improvements And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	66,514	66,746
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,770	8,106
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,526	22,746
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,389	8,195
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,660	25,654
Oil and Gas Producing Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 30,031	$ 28,984