Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 200,165	$ 253,256
Restricted cash	13,879	10,859
Investments in marketable equity securities and other investments	599,967	514,581
Accounts receivable, net	624,216	582,280
Income taxes receivable	10,735	19,166
Inventories and contracts in progress	108,928	69,477
Other current assets	105,595	82,723
Total Current Assets	1,663,485	1,532,342
Property, Plant and Equipment, Net	384,670	293,085
Lease Right-of-Use Assets	526,417	0
Investments in Affiliates	162,249	143,813
Goodwill, Net	1,388,279	1,297,712
Indefinite-Lived Intangible Assets	140,197	99,052
Amortized Intangible Assets, Net	233,481	263,261
Prepaid Pension Cost	1,292,350	1,003,558
Deferred Income Taxes	11,629	13,388
Deferred Charges and Other Assets	128,479	117,830
Total Assets	5,931,236	4,764,041
Current Liabilities
Accounts payable and accrued liabilities	507,701	486,578
Deferred revenue	355,156	308,728
Income taxes payable	4,121	10,496
Current portion of lease liabilities	92,714	0
Current portion of long-term debt	82,179	6,360
Total Current Liabilities	1,041,871	812,162
Accrued Compensation and Related Benefits	193,836	179,652
Other Liabilities	27,223	57,901
Deferred Income Taxes	427,372	322,421
Mandatorily Redeemable Noncontrolling Interest	829	0
Lease Liabilities	477,004	0
Long-Term Debt	430,650	470,777
Total Liabilities	2,598,785	1,842,913
Commitments and Contingencies (Note 18)
Redeemable Noncontrolling Interests	5,655	4,346
Preferred Stock, $1 par value; 977,000 shares authorized, none issued	0	0
Common Stockholders’ Equity
Capital in excess of par value	381,669	378,837
Retained earnings	6,534,427	6,236,125
Accumulated other comprehensive income, net of taxes
Cumulative foreign currency translation adjustment	(21,888)	(29,270)
Unrealized gain on pensions and other postretirement plans	325,921	232,836
Cash flow hedges	(738)	263
Cost of 14,687,763 and 14,699,041 shares of Class B common stock held in treasury	(3,920,152)	(3,922,009)
Total Common Stockholders' Equity	3,319,239	2,916,782
Noncontrolling Interests	7,557	0
Total Equity	3,326,796	2,916,782
Total Liabilities and Equity	5,931,236	4,764,041
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