XML 16 R5.htm IDEA: XBRL DOCUMENT v3.24.1.u1
CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Allowance for credit losses $ 217 $ 234
Property, plant and equipment, accumulated amortization, depreciation and amortization 588,735 558,905
Owned and lease mineral rights, accumulated depletion and amortization 106,429 99,826
Other acquired intangibles, accumulated amortization $ 40,218 $ 38,543
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) 22,371,165 22,058,135
Common stock, shares outstanding (in shares) 13,007,215 12,938,679
Treasury stock, shares at cost (in shares) 9,363,950 9,119,456