Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 428,324	$ 213,534
Depreciation and amortization	420,970	377,722
Other operating activities and non-cash items	22,222	20,368
Changes in assets and liabilities	(239,897)	(177,576)
Net cash provided by operating activities	631,619	434,048
Cash flows from investing activities:
Payments for property, plant and equipment	(491,425)	(275,531)
Proceeds from sale of property, plant and equipment	2,722	2,710
Proceeds from foreign exchange forward contracts	13,414	26,912
Payments for foreign exchange forward contracts	(51,296)	(13,666)
Payments for short-term investments	(348,822)	(475,696)
Proceeds from sale of short-term investments	70,085	37,633
Proceeds from maturities of short-term investments	165,774	86,216
Other investing activities	3,179	85
Net cash used in investing activities	(636,369)	(611,337)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	312,000
Payments of revolving credit facilities	0	(332,000)
Proceeds from short-term debt	15,514	86,769
Payments of short-term debt	(14,228)	(76,004)
Proceeds from issuance of long-term debt	154,784	225,985
Payments of long-term debt	(250,402)	(370,426)
Payments of finance lease obligations	(12,785)	(7,193)
Payments of dividends	(38,993)	0
Other financing activities	9,462	7,707
Net cash used in financing activities	(136,648)	(153,162)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(10,770)	2,696
Net decrease in cash, cash equivalents and restricted cash	(152,168)	(327,755)
Cash, cash equivalents and restricted cash, beginning of period	702,197	898,532
Cash, cash equivalents and restricted cash, end of period	550,029	570,777
Non-cash investing and financing activities:
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	58,625	2,726
Property, plant and equipment included in capital expenditures payable	393,781	328,354
Right of use assets acquired through operating lease liabilities	$ 39,916	$ 32,398