CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 204,620	$ 289,472
Short-term marketable securities	288,325	162,094
Accounts receivable (net of allowances of $11,770 as of September 30, 2024 and $12,800 as of December 31, 2023)	188,947	242,488
Prepaid expenses	44,927	59,712
Other current assets	68,161	27,887
Total current assets	794,980	781,653
Other assets
Long-term marketable securities	327,435	257,633
Property, plant and equipment (less accumulated depreciation and amortization of $903,880 as of September 30, 2024 and $870,329 as of December 31, 2023)	495,056	514,245
Goodwill	416,782	416,098
Intangible assets, net	264,810	285,490
Deferred income taxes	131,497	114,505
Miscellaneous assets	331,541	344,971
Total assets	2,762,101	2,714,595
Current liabilities
Accounts payable	137,104	116,942
Accrued payroll and other related liabilities	146,105	174,316
Unexpired subscriptions revenue	177,215	172,772
Accrued expenses and other	129,174	147,529
Total current liabilities	589,598	611,559
Other liabilities
Pension benefits obligation	211,334	219,451
Postretirement benefits obligation	18,770	19,402
Other	90,347	100,964
Total other liabilities	320,451	339,817
Common stock of $.10 par value:
Additional paid-in capital	334,601	301,287
Retained earnings	2,222,977	2,117,839
Common stock held in treasury, at cost	(381,569)	(320,820)
Accumulated other comprehensive loss, net of income taxes:
Foreign currency translation adjustments	1,087	910
Funded status of benefit plans	(346,021)	(353,286)
Net unrealized gain/(loss) on available-for-sale securities	3,123	(486)
Total accumulated other comprehensive loss, net of income taxes	(341,811)	(352,862)
Total stockholders’ equity	1,852,052	1,763,219
Total liabilities and stockholders’ equity	2,762,101	2,714,595
Class A Common Stock
Common stock of $.10 par value:
Common stock value	17,776	17,697
Class B Common Stock
Common stock of $.10 par value:
Common stock value	$ 78	$ 78