Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 253,256	$ 390,014
Restricted cash	10,859	17,552
Investments in marketable equity securities and other investments	514,581	557,153
Accounts receivable, net	582,280	620,319
Income taxes receivable	19,166	23,901
Inventories and contracts in progress	69,477	60,612
Other current assets	82,723	66,253
Total Current Assets	1,532,342	1,735,804
Property, Plant and Equipment, Net	293,085	259,358
Investments in Affiliates	143,813	128,590
Goodwill, Net	1,297,712	1,299,710
Indefinite-Lived Intangible Assets	99,052	102,195
Amortized Intangible Assets, Net	263,261	237,976
Prepaid Pension Cost	1,003,558	1,056,777
Deferred Income Taxes	13,388	15,367
Deferred Charges and Other Assets	117,830	102,046
Total Assets	4,764,041	4,937,823
Current Liabilities
Accounts payable and accrued liabilities	486,578	526,323
Deferred revenue	308,728	339,454
Income taxes payable	10,496	6,109
Current portion of long-term debt	6,360	6,726
Total Current Liabilities	812,162	878,612
Accrued Compensation and Related Benefits	179,652	213,889
Other Liabilities	57,901	65,977
Deferred Income Taxes	322,421	362,701
Mandatorily Redeemable Noncontrolling Interest	0	10,331
Long-Term Debt	470,777	486,561
Total Liabilities	1,842,913	2,018,071
Commitments and Contingencies (Notes 17 and 18)
Redeemable Noncontrolling Interests	4,346	4,607
Preferred Stock, $1 par value; 977,000 shares authorized, none issued	0	0
Common Stockholders’ Equity
Capital in excess of par value	378,837	370,700
Retained earnings	6,236,125	5,791,724
Accumulated other comprehensive income, net of taxes
Cumulative foreign currency translation adjustment	(29,270)	6,314
Unrealized gain on available-for-sale securities	0	194,889
Unrealized gain on pensions and other postretirement plans	232,836	334,536
Cash flow hedge	263	(184)
Cost of 14,699,041 and 14,495,506 shares of Class B common stock held in treasury	(3,922,009)	(3,802,834)
Total Equity	2,916,782	2,915,145
Total Liabilities and Equity	4,764,041	4,937,823
Class A Common Stock [Member]
Common Stockholders’ Equity
Common stock	964	964
Class B Common Stock [Member]
Common Stockholders’ Equity
Common stock	$ 19,036	$ 19,036