CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 326,724	$ 325,975
Accounts receivable, net of allowance for credit losses of $6,918 as of March 31, 2025 and $7,906 as of December 31, 2024	252,268	276,577
Inventories	109,761	107,628
Income taxes receivable	89	4,332
Prepaid expenses	13,182	16,136
Other current assets	2,021	2,194
Total current assets	704,045	732,842
Property, plant and equipment, less accumulated depreciation of $874,056 as of March 31, 2025 and $860,227 as of December 31, 2024	503,910	513,516
Operating lease right-of-use assets	26,023	27,465
Finance lease right-of-use assets	4,682	4,400
Goodwill	50,824	50,824
Other intangibles, net	13,251	13,843
Retirement plan assets	30,674	30,666
Other assets	12,510	12,933
Total assets	1,345,919	1,386,489
LIABILITIES
Accounts payable	88,760	84,494
Accrued payroll and related expenses	21,888	25,243
Accrued insurance expenses	6,891	7,942
Accrued state, local and other taxes	5,438	3,234
Income taxes payable	3,010	446
Unearned revenue	1,381	45,376
Current portion of operating lease liabilities	7,033	7,108
Current portion of finance lease liabilities and finance obligations	3,796	3,522
Accrued expenses and other liabilities	4,101	4,548
Total current liabilities	142,298	181,913
Long-term accrued insurance expenses	13,942	12,175
Long-term retirement plan liabilities	23,211	24,539
Long-term operating lease liabilities	19,599	21,724
Long-term finance lease liabilities	491	559
Other long-term liabilities	9,272	9,099
Deferred income taxes	55,520	58,189
Total liabilities	264,333	308,198
Commitments and contingencies (Note 11)
STOCKHOLDERS' EQUITY
Preferred stock, $0.10 par value, 1,000,000 shares authorized, none issued
Common stock, $0.10 par value, 349,000,000 shares authorized, 216,019,054 and 214,972,351 shares issued and outstanding in 2025 and 2024, respectively	21,602	21,494
Capital in excess of par value	0	0
Retained earnings	1,062,805	1,059,625
Accumulated other comprehensive loss	(2,821)	(2,828)
Total stockholders' equity	1,081,586	1,078,291
Total liabilities and stockholders' equity	$ 1,345,919	$ 1,386,489