CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 182,597	$ 199,448
Short-term marketable securities	339,477	366,474
Accounts receivable (net of allowances of $11,612 as of March 31, 2025, and $12,118 as of December 31, 2024)	192,514	249,530
Prepaid expenses	49,868	49,869
Other current assets	37,118	71,001
Total current assets	801,574	936,322
Other assets
Long-term marketable securities	380,249	345,946
Property, plant and equipment (less accumulated depreciation and amortization of $920,195 as of March 31, 2025, and $905,512 as of December 31, 2024)	482,729	488,816
Goodwill	414,795	412,173
Intangible assets, net	251,203	258,006
Deferred income taxes	123,038	111,397
Miscellaneous assets	281,477	288,819
Total assets	2,735,065	2,841,479
Current liabilities
Accounts payable	121,628	123,606
Accrued payroll and other related liabilities	95,780	177,859
Unexpired subscriptions revenue	193,705	187,082
Accrued expenses and other	143,740	124,982
Total current liabilities	554,853	613,529
Other liabilities
Pension and postretirement benefits obligation	215,478	214,641
Other	79,878	86,100
Total other liabilities	295,356	300,741
Common stock of $.10 par value:
Additional paid-in capital	347,486	356,450
Retained earnings	2,345,027	2,325,142
Common stock held in treasury, at cost	(465,628)	(406,446)
Accumulated other comprehensive loss, net of income taxes:
Foreign currency translation adjustments	(928)	(2,762)
Funded status of benefit plans	(360,627)	(363,874)
Net unrealized gain on available-for-sale securities	1,583	830
Total accumulated other comprehensive loss, net of income taxes	(359,972)	(365,806)
Total stockholders’ equity	1,884,856	1,927,209
Total liabilities and stockholders’ equity	2,735,065	2,841,479
Class A Common Stock
Common stock of $.10 par value:
Common stock value	17,865	17,791
Class B Common Stock
Common stock of $.10 par value:
Common stock value	$ 78	$ 78