Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 100,671	$ 166,520
Depreciation and amortization	429,181	435,667
Gain on sale of real estate	0	(108,109)
Other operating activities and non-cash items	(2,006)	(8,124)
Changes in assets and liabilities	(100,628)	(72,043)
Net cash provided by operating activities	427,218	413,911
Cash flows from investing activities:
Payments for property, plant and equipment	(478,036)	(413,974)
Proceeds from sale of property, plant and equipment	1,606	133,320
Acquisition of business, net of cash acquired	0	(43,771)
Other investing activities	3,160	(1,600)
Net cash used in investing activities	(473,270)	(326,025)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	75,000
Payments of revolving credit facilities	(75,000)	0
Proceeds from short-term debt	23,341	50,333
Payments of short-term debt	(35,125)	(52,068)
Proceeds from issuance of long-term debt	372,226	223,976
Payments of long-term debt	(279,697)	(398,755)
Payments of long-term debt, related party	0	(17,837)
Payment of deferred consideration for purchase of facility	0	(3,890)
Payments of capital lease obligations	(2,669)	(4,123)
Other financing activities	(2,482)	425
Net cash provided by (used in) financing activities	594	(126,939)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(3,273)	9,231
Net decrease in cash, cash equivalents and restricted cash	(48,731)	(29,822)
Cash, cash equivalents and restricted cash, beginning of period	602,851	555,495
Cash, cash equivalents and restricted cash, end of period	554,120	525,673
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	254,244	290,738
Equipment acquired through capital lease	$ 13,272	$ 929