CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 206,817	$ 289,472
Short-term marketable securities	172,238	162,094
Accounts receivable (net of allowances of $12,637 in 2024 and $12,800 in 2023)	177,656	242,488
Prepaid expenses	59,049	59,712
Other current assets	65,400	27,887
Total current assets	681,160	781,653
Other assets
Long-term marketable securities	307,204	257,633
Property, plant and equipment (less accumulated depreciation and amortization of $882,583 in 2024 and $870,329 in 2023)	507,737	514,245
Goodwill	414,627	416,098
Intangible assets, net	278,418	285,490
Deferred income taxes	120,688	114,505
Miscellaneous assets	312,988	344,971
Total assets	2,622,822	2,714,595
Current liabilities
Accounts payable	120,660	116,942
Accrued payroll and other related liabilities	88,564	174,316
Unexpired subscriptions revenue	178,210	172,772
Accrued expenses and other	157,283	147,529
Total current liabilities	544,717	611,559
Other liabilities
Pension benefits obligation	216,879	219,451
Postretirement benefits obligation	19,520	19,402
Other	93,744	100,964
Total other liabilities	330,143	339,817
Common stock of $.10 par value:
Additional paid-in capital	299,483	301,287
Retained earnings	2,136,537	2,117,839
Common stock held in treasury, at cost	(353,529)	(320,820)
Accumulated other comprehensive loss, net of income taxes:
Foreign currency translation adjustments	(453)	910
Funded status of benefit plans	(350,897)	(353,286)
Net unrealized loss on available-for-sale securities	(1,009)	(486)
Total accumulated other comprehensive loss, net of income taxes	(352,359)	(352,862)
Total stockholders’ equity	1,747,962	1,763,219
Total liabilities and stockholders’ equity	2,622,822	2,714,595
Class A Common Stock
Common stock of $.10 par value:
Common stock value	17,752	17,697
Class B Common Stock
Common stock of $.10 par value:
Common stock value	$ 78	$ 78