CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ (43,308)	$ (12,061)
Adjustments to reconcile net earnings (loss) to cash provided (utilized) by operating activities:
Depreciation of fixed assets	45,264	51,907
Amortization of intangibles	4,567	4,747
(Earnings) loss from equity method investments, net of distributions	2,115	1,854
Gain on sale of property, plant and equipment	(1,858)	(2,153)
Amortization of stock-based awards	13,242	13,917
Deferred compensation trust	(26,145)	1,025
Deferred compensation obligation	28,584	930
Deferred taxes	(25,549)	(37,920)
Net retirement plan accrual (contributions)	(3,577)	(5,235)
Changes in operating assets and liabilities	(13,928)	(151,051)
Other items	3,117	(1,962)
Cash utilized by operating activities	(17,476)	(136,002)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of marketable securities	(8,180)	(44,868)
Proceeds from the sales and maturities of marketable securities	124,299	175,784
Capital expenditures	(48,172)	(65,082)
Proceeds from disposal of property, plant and equipment	10,720	16,494
Investments in partnerships and joint ventures	(12,001)	(15,574)
Other items	1,090	128
Cash provided by investing activities	67,756	66,882
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(30,005)	(30,242)
Distributions paid to noncontrolling interests	(10,152)	(23,226)
Capital contributions by noncontrolling interests	4,767	365
Taxes paid on vested restricted stock	(3,549)	(5,455)
Stock options exercised	1,466	4,019
Other items	7,653	(3,440)
Cash utilized by financing activities	(29,820)	(57,979)
Effect of exchange rate changes on cash	20,571	8,978
Increase (decrease) in cash and cash equivalents	41,031	(118,121)
Cash and cash equivalents at beginning of period	1,764,746	1,804,075
Cash and cash equivalents at end of period	$ 1,805,777	$ 1,685,954