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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for credit losses, current $ 2,714 $ 2,519
Property, plant and equipment, accumulated depreciation and amortization 837,738 774,101
Owned and lease mineral rights, accumulated depletion and amortization 162,223 150,616
Other acquired intangibles, accumulated amortization $ 44,825 $ 43,072
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 22,496,891 22,437,379
Common stock, shares outstanding (in shares) 12,685,495 12,805,909
Treasury stock, at cost (in shares) 9,811,396 9,631,470