CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Consolidated net income (loss)	$ 586,464	$ (200,168)	$ 721,574
Adjustments to reconcile consolidated net income (loss) to net cash provided by operations:
Depreciation and amortization	189,058	189,790	186,384
Amortization of stock-based compensation	35,288	41,070	46,238
Equity in losses of affiliated companies	531	2,765	2,332
Deferred income taxes	29,713	(50,288)	1,236
Loss (gain) on investments, net	(5,333)	(11,462)	14,166
Loss on disposition of businesses, net	0	21,252	3,604
Pension settlement loss	0	20,111	1,665
Impairments	7,223	698,246	0
Other	5,059	10,659	9,198
Change in assets and liabilities, net of effects of acquired and disposed businesses:
Accounts receivable, net	(541,427)	338,849	(1,007,308)
Inventories	244,325	383,058	(618,875)
Accounts payable	760,883	(521,575)	936,423
Accrued expenses	86,484	(27,475)	112,123
Other assets and liabilities	(38,425)	(36,837)	(136,070)
Net cash provided by operating activities	1,359,843	857,995	272,690
Cash flows from investing activities:
Cash consideration paid for acquired businesses, net of cash acquired	0	0	(331,563)
Proceeds from (cash paid on) disposition of businesses	0	(13,094)	32,013
Acquisition of property, plant, and equipment	(123,585)	(143,191)	(135,336)
Proceeds from sale of property, plant, and equipment	0	0	5,421
Cash paid for customer relationship intangible asset	(713)	(7,616)	(20,000)
Other	(14,496)	(9,682)	(13,500)
Net cash used for investing activities	(138,794)	(173,583)	(462,965)
Cash flows from financing activities:
Change in short-term and other borrowings	(95,017)	(113,923)	192,192
Proceeds from (repayments of) long-term bank borrowings, net	(411,497)	(405,007)	306,635
Redemption of notes	(209,366)	0	(300,000)
Proceeds from exercise of stock options	21,037	16,911	8,819
Repurchases of common stock	(483,735)	(404,203)	(243,305)
Settlement of forward-starting interest rate swap	(48,378)	0	0
Other	(141)	(147)	(1,174)
Net cash used for financing activities	(1,227,097)	(906,369)	(36,833)
Effect of exchange rate changes on cash	79,560	12,733	6,352
Net increase (decrease) in cash and cash equivalents	73,512	(209,224)	(220,756)
Cash and cash equivalents at beginning of year	300,103	509,327	730,083
Cash and cash equivalents at end of year	$ 373,615	$ 300,103	$ 509,327