Property, Plant and Equipment, Net (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 511,373	$ 541,916
Accumulated depreciation and depletion	(227,467)	(185,642)
Property, plant and equipment, net	283,906	356,274
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	379,849	360,353
Buildings, Improvements And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	71,965	75,374
Automobiles, Trucks, Tractors and Trailers [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,326	6,450
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,563	19,668
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,696	6,700
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,796	28,671
Oil and Gas Producing Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 178	$ 44,700