CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 222,946	$ 289,472
Short-term marketable securities	188,436	162,094
Accounts receivable (net of allowances of $12,550 as of June 30, 2024 and $12,800 as of December 31, 2023)	181,280	242,488
Prepaid expenses	50,410	59,712
Other current assets	73,081	27,887
Total current assets	716,153	781,653
Other assets
Long-term marketable securities	312,593	257,633
Property, plant and equipment (less accumulated depreciation and amortization of $889,750 as of June 30, 2024 and $870,329 as of December 31, 2023)	502,740	514,245
Goodwill	414,163	416,098
Intangible assets, net	271,614	285,490
Deferred income taxes	128,152	114,505
Miscellaneous assets	327,953	344,971
Total assets	2,673,368	2,714,595
Current liabilities
Accounts payable	120,902	116,942
Accrued payroll and other related liabilities	124,426	174,316
Unexpired subscriptions revenue	174,904	172,772
Accrued expenses and other	122,897	147,529
Total current liabilities	543,129	611,559
Other liabilities
Pension benefits obligation	213,638	219,451
Postretirement benefits obligation	19,169	19,402
Other	92,446	100,964
Total other liabilities	325,253	339,817
Common stock of $.10 par value:
Additional paid-in capital	320,111	301,287
Retained earnings	2,180,425	2,117,839
Common stock held in treasury, at cost	(363,086)	(320,820)
Accumulated other comprehensive loss, net of income taxes:
Foreign currency translation adjustments	(887)	910
Funded status of benefit plans	(348,447)	(353,286)
Net unrealized loss on available-for-sale securities	(978)	(486)
Total accumulated other comprehensive loss, net of income taxes	(350,312)	(352,862)
Total stockholders’ equity	1,804,986	1,763,219
Total liabilities and stockholders’ equity	2,673,368	2,714,595
Class A Common Stock
Common stock of $.10 par value:
Common stock value	17,770	17,697
Class B Common Stock
Common stock of $.10 par value:
Common stock value	$ 78	$ 78