CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 100,535	$ 126,424
Accounts receivable, net of allowance for credit losses of $6,574 in 2023 and $7,078 in 2022	393,609	416,568
Inventories	104,194	97,107
Income taxes receivable	53,148	42,403
Prepaid expenses	14,427	17,753
Purchase of business - advance (Note 16)	78,982
Other current assets	3,440	3,086
Total current assets	748,335	703,341
Property, plant and equipment, less accumulated depreciation of $782,144 in 2023 and $775,334 in 2022	387,988	333,093
Operating lease right-of-use assets	27,331	28,864
Goodwill	32,150	32,150
Other assets	32,384	31,565
Total assets	1,228,188	1,129,013
LIABILITIES
Accounts payable	88,006	115,213
Accrued payroll and related expenses	26,099	33,161
Accrued insurance expenses	5,165	3,232
Accrued state, local and other taxes	6,417	4,296
Income taxes payable	404	499
Pension liabilities		9,610
Current portion of operating lease liabilities	9,201	10,728
Other accrued expenses	1,807	1,864
Total current liabilities	137,099	178,603
Long-term accrued insurance expenses	9,640	7,149
Long-term retirement plan liabilities	23,526	23,106
Deferred income taxes	47,028	37,473
Long-term operating lease liabilities	19,555	19,517
Other long-term liabilities	3,938	5,430
Total liabilities	240,786	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, 216,408,974 and 216,609,191 shares issued and outstanding in 2023 and 2022, respectively	21,641	21,661
Capital in excess of par value	0	0
Retained earnings	968,023	856,013
Accumulated other comprehensive loss	(2,262)	(19,939)
Total stockholders' equity	987,402	857,735
Total liabilities and stockholders' equity	$ 1,228,188	$ 1,129,013