Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 171,228	$ 120,019
Depreciation and amortization	148,192	135,390
Other operating activities and non-cash items	11,061	2,370
Changes in assets and liabilities	(164,303)	(80,991)
Net cash provided by operating activities	166,178	176,788
Cash flows from investing activities:
Payments for property, plant and equipment	(158,154)	(110,351)
Proceeds from sale of property, plant and equipment	416	547
Proceeds from foreign exchange forward contracts	1,828	2,960
Payments for foreign exchange forward contracts	(29,803)	(28,306)
Payments for short-term investments	(125,693)	(92,879)
Proceeds from sale of short-term investments	4,246	19,838
Proceeds from maturities of short-term investments	66,694	43,790
Other investing activities	457	29
Net cash used in investing activities	(240,009)	(164,372)
Cash flows from financing activities:
Proceeds from short-term debt	18,112	3,679
Payments of short-term debt	(3,790)	(7,803)
Proceeds from issuance of long-term debt	150,000	50,000
Payments of long-term debt	(35,973)	(79,684)
Payments of finance lease obligations	(7,538)	(3,216)
Payments of dividends	(12,228)	(19,457)
Other financing activities	653	7,037
Net cash provided by (used in) financing activities	109,236	(49,444)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(7,795)	(10,397)
Net increase (decrease) in cash, cash equivalents and restricted cash	27,610	(47,425)
Cash, cash equivalents and restricted cash, beginning of period	831,521	702,197
Cash, cash equivalents and restricted cash, end of period	859,131	654,772
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	268,146	273,971
Right of use assets acquired through finance lease liabilities	6,438	0
Right of use assets acquired through operating lease liabilities	$ 27,246	$ 8,109