CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 78,233	$ 82,433
Accounts receivable, net of allowance for credit losses of $5,831 in 2022 and $5,717 in 2021	357,582	258,635
Inventories	90,090	78,983
Income taxes receivable	45,477	58,504
Prepaid expenses	8,717	9,773
Assets held for sale	692	692
Other current assets	2,429	2,990
Total current assets	583,220	492,010
Property, plant and equipment, less accumulated depreciation of $776,163 in 2022 and $788,922 in 2021	269,521	254,408
Operating lease right-of-use assets	22,970	24,572
Finance lease right-of-use assets	21,624	20,327
Goodwill	32,150	32,150
Other assets	35,594	40,898
Total assets	965,079	864,365
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	102,190	74,404
Accrued payroll and related expenses	24,218	15,350
Accrued insurance expenses	5,599	10,129
Accrued state, local and other taxes	4,982	1,905
Income taxes payable	528	656
Pension liabilities	6,185
Current portion of operating lease liabilities	6,577	6,387
Current portion of finance lease liabilities	21,304	20,194
Other accrued expenses	1,650	1,824
Total current liabilities	173,233	130,849
Long-term accrued insurance expenses	9,930	11,770
Long-term pension and retirement plans liabilities	24,247	35,376
Deferred income taxes	25,663	17,749
Long-term operating lease liabilities	17,804	19,719
Other long-term liabilities	7,540	7,111
Total liabilities	258,417	222,574
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, 216,661,757 and 215,628,716 shares issued and outstanding in 2022 and 2021, respectively	21,666	21,563
Capital in excess of par value	0	0
Retained earnings	705,133	640,936
Accumulated other comprehensive loss	(20,137)	(20,708)
Total stockholders' equity	706,662	641,791
Total liabilities and stockholders' equity	$ 965,079	$ 864,365