Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 555,320	$ 1,137,303
Cash flows from operating activities:
Net income	326,496	449,611
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	102,231	100,804
Gain on sale of business	0	(218,705)
Gain on sale of property	(11,079)	0
Stock-based compensation and other	10,136	8,076
Equity in net income of unconsolidated investments (net of tax)	(73,491)	(39,646)
Dividends received from unconsolidated investments and nonmarketable securities	60,291	30,045
Pension and postretirement expense (benefit)	1,055	(1,793)
Pension and postretirement contributions	(7,778)	(7,089)
Unrealized gain on investments in marketable securities	(577)	(625)
Deferred income taxes	3,570	30,708
Working capital changes	(223,238)	(91,189)
Other, net	11,672	(36,340)
Net cash provided by operating activities	199,288	223,857
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(7,643)
Capital expenditures	(415,626)	(280,945)
Cash proceeds from divestitures, net	0	416,711
Proceeds from sale of property and equipment	10,356	0
Sales of marketable securities, net	908	(439)
Investments in equity and other corporate investments	(2,549)	(1,979)
Net cash (used in) provided by investing activities	(406,911)	125,705
Cash flows from financing activities:
Other borrowings (repayments), net	183,052	(211,833)
Dividends paid to shareholders	(74,313)	(72,484)
Dividends paid to noncontrolling interests	(38,962)	(7,378)
Repurchases of common stock	0	(250,000)
Proceeds from exercise of stock options	3,205	1,288
Withholding taxes paid on stock-based compensation award distributions	(10,570)	(16,460)
Other	(445)	0
Net cash provided by (used in) financing activities	61,967	(556,867)
Net effect of foreign exchange on cash and cash equivalents	(11,481)	(21,854)
Decrease in cash and cash equivalents	(157,137)	(229,159)
Cash and cash equivalents at end of period	$ 398,183	$ 908,144

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