Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 43,379	$ 106,062
Depreciation and amortization	285,515	287,068
Gain on sale of real estate	0	(108,109)
Other operating activities and non-cash items	(3,239)	(4,659)
Changes in assets and liabilities	(119,276)	(80,403)
Net cash provided by operating activities	206,379	199,959
Cash flows from investing activities:
Payments for property, plant and equipment	(389,568)	(271,651)
Proceeds from sale of property, plant and equipment	603	130,962
Acquisition of business, net of cash acquired	0	(43,771)
Other investing activities	2,647	(2,117)
Net cash used in investing activities	(386,318)	(186,577)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	75,000
Proceeds from short-term debt	7,264	41,228
Payments of short-term debt	(31,546)	(32,110)
Proceeds from issuance of long-term debt	64,000	215,086
Payments of long-term debt	(77,015)	(207,653)
Payment of deferred consideration for purchase of facility	0	(3,890)
Payments of capital lease obligations	(1,689)	(2,665)
Other financing activities	492	561
Net cash provided by (used in) financing activities	(38,494)	85,557
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	1,347	9,418
Net increase (decrease) in cash, cash equivalents and restricted cash	(217,086)	108,357
Cash, cash equivalents and restricted cash, beginning of period	602,851	555,495
Cash, cash equivalents and restricted cash, end of period	385,765	663,852
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	239,460	233,084
Equipment acquired through capital lease	$ 6,477	$ 929