CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 177,904	$ 126,424
Accounts receivable, net of allowance for credit losses of $5,920 in 2023 and $7,078 in 2022	400,359	416,568
Inventories	98,073	97,107
Income taxes receivable	24,346	42,403
Prepaid expenses	16,028	17,753
Other current assets	2,914	3,086
Total current assets	719,624	703,341
Property, plant and equipment, less accumulated depreciation of $768,195 in 2023 and $775,334 in 2022	375,461	333,093
Operating lease right-of-use assets	28,801	28,864
Goodwill	32,150	32,150
Other assets	31,794	31,565
Total assets	1,187,830	1,129,013
LIABILITIES
Accounts payable	114,357	115,213
Accrued payroll and related expenses	19,968	33,161
Accrued insurance expenses	4,097	3,232
Accrued state, local and other taxes	5,987	4,296
Income taxes payable	513	499
Pension liabilities	1,150	9,610
Current portion of operating lease liabilities	10,578	10,728
Other accrued expenses	1,864	1,864
Total current liabilities	158,514	178,603
Long-term accrued insurance expenses	9,167	7,149
Long-term retirement plan liabilities	22,559	23,106
Deferred income taxes	44,990	37,473
Long-term operating lease liabilities	19,638	19,517
Other long-term liabilities	5,267	5,430
Total liabilities	260,135	271,278
Commitments and contingencies (Note 9)
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, 216,369,714 and 216,609,191 shares issued and outstanding in 2023 and 2022, respectively	21,637	21,661
Capital in excess of par value	0	0
Retained earnings	909,335	856,013
Accumulated other comprehensive loss	(3,277)	(19,939)
Total stockholders' equity	927,695	857,735
Total liabilities and stockholders' equity	$ 1,187,830	$ 1,129,013