CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 223,310	$ 126,424
Accounts receivable, net of allowance for credit losses of $7,109 in 2023 and $7,078 in 2022	324,915	416,568
Inventories	110,904	97,107
Income taxes receivable	52,269	42,403
Prepaid expenses	12,907	17,753
Other current assets	2,768	3,086
Total current assets	727,073	703,341
Property, plant and equipment, less accumulated depreciation of $810,933 in 2023 and $775,334 in 2022	435,139	333,093
Operating lease right-of-use assets	24,537	28,864
Finance lease right-of-use assets	1,036
Goodwill	50,824	32,150
Other intangibles, net	12,825	1,084
Other assets	35,411	30,481
Total assets	1,286,845	1,129,013
LIABILITIES
Accounts payable	85,036	115,213
Accrued payroll and related expenses	30,956	33,161
Accrued insurance expenses	5,340	3,232
Accrued state, local and other taxes	4,461	4,296
Income taxes payable	275	499
Unearned revenue	15,743
Pension liabilities		9,610
Current portion of operating lease liabilities	7,367	10,728
Current portion of finance lease liabilities and finance obligations	375
Accrued expenses and other liabilities	2,304	1,864
Total current liabilities	151,857	178,603
Long-term accrued insurance expenses	10,202	7,149
Long-term retirement plan liabilities	23,724	23,106
Deferred income taxes	51,290	37,473
Long-term operating lease liabilities	18,600	19,517
Long-term finance lease liabilities	819
Other long-term liabilities	7,840	5,430
Total liabilities	264,332	271,278
Commitments and contingencies (Note 16)
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, 215,026,458 and 216,609,191 shares issued and outstanding in 2023 and 2022, respectively	21,502	21,661
Capital in excess of par value	0	0
Retained earnings	1,003,380	856,013
Accumulated other comprehensive loss	(2,369)	(19,939)
Total stockholders' equity	1,022,513	857,735
Total liabilities and stockholders' equity	$ 1,286,845	$ 1,129,013