CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
NET EARNINGS	$ 292,958	$ 264,469	$ 327,449
Adjustments to reconcile net earnings to cash provided (utilized) by operating activities:
Depreciation of fixed assets	197,585	206,113	211,095
Amortization of intangibles	19,071	19,156	14,818
(Earnings) loss from equity method investments, net of distributions	980	2,849	12,180
Gain on sale of joint venture interest	(124,942)	0	0
Gain on sale of property, plant and equipment	(22,132)	(22,746)	(21,604)
Amortization of stock-based awards	43,029	40,669	40,086
Deferred compensation trust	18,010	(49,539)	(22,332)
Deferred compensation obligation	(22,272)	52,615	29,323
Statute expirations and tax settlements	0	0	(13,280)
Deferred taxes	70,594	100,286	(7,912)
Net retirement plan accrual (contributions)	(16,472)	(8,846)	(1,756)
Changes in operating assets and liabilities	(297,722)	(11,899)	135,393
Other items	3,477	8,844	2,459
Cash provided by operating activities	162,164	601,971	705,919
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of marketable securities	(483,513)	(237,360)	(359,986)
Proceeds from the sales and maturities of marketable securities	541,104	216,436	522,094
Capital expenditures	(210,998)	(283,107)	(235,904)
Proceeds from disposal of property, plant and equipment	81,038	96,102	81,162
Proceeds from sale of joint venture interest	124,942	0	0
Investments in partnerships and joint ventures	(73,145)	(273,117)	(518,220)
Return of capital from partnerships and joint ventures	22,284	3,249	3,783
Acquisitions, net of cash acquired	0	0	(240,740)
Other items	(329)	(6,481)	6,460
Cash provided (utilized) by investing activities	1,383	(484,278)	(741,351)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(50,022)	0	(9,718)
Dividends paid	(118,734)	(117,995)	(117,995)
Proceeds from issuance of Senior Notes	598,722	0	552,958
Repayment of 3.375% Senior Notes and Stork Notes	(503,285)	0	(333,654)
Borrowings under revolving lines of credit	0	0	882,142
Repayment of borrowings under revolving lines of credit	0	(53,455)	(917,027)
Debt issuance costs	(5,061)	0	(3,513)
Distributions paid to noncontrolling interests	(63,523)	(47,215)	(57,904)
Capital contributions by noncontrolling interests	5,128	6,397	9,072
Taxes paid on vested restricted stock	(5,686)	(6,186)	(7,007)
Stock options exercised	7,258	9,380	3,658
Other items	(5,288)	(6,428)	(11,362)
Cash utilized by financing activities	(140,491)	(215,502)	(10,350)
Effect of exchange rate changes on cash	(62,385)	51,448	(53,668)
Decrease in cash and cash equivalents	(39,329)	(46,361)	(99,450)
Cash and cash equivalents at beginning of year	1,804,075	1,850,436	1,949,886
Cash and cash equivalents at end of year	$ 1,764,746	$ 1,804,075	$ 1,850,436