Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 64,497	$ (22,668)
Depreciation and amortization	123,657	135,835
Other operating activities and non-cash items	8,287	15,928
Changes in assets and liabilities	(99,852)	(77,038)
Net cash provided by operating activities	96,589	52,057
Cash flows from investing activities:
Payments for property, plant and equipment	(55,888)	(203,216)
Proceeds from sale of property, plant and equipment	1,887	180
Proceeds from insurance recovery for property, plant and equipment	0	1,538
Payments for short-term investments	(55,754)	0
Other investing activities	5,163	(569)
Net cash used in investing activities	(104,592)	(202,067)
Cash flows from financing activities:
Proceeds from revolving credit facilities	201,000	0
Proceeds from short-term debt	14,086	29,781
Payments of short-term debt	(9,409)	(10,588)
Proceeds from issuance of long-term debt	24,000	572,375
Payments of long-term debt	(172,336)	(63,636)
Payments of finance lease obligations	(2,355)	(1,376)
Other financing activities	109	(2,848)
Net cash provided by financing activities	55,095	523,708
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(300)	(829)
Net increase in cash, cash equivalents and restricted cash	46,792	372,869
Cash, cash equivalents and restricted cash, beginning of period	898,532	688,051
Cash, cash equivalents and restricted cash, end of period	945,324	1,060,920
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	$ 107,344	$ 124,547