CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Cash flows from operating activities	$ 123,928	$ 106,340
Cash flows from investing activities
Acquisition net of cash acquired	(41)
Purchases of property, plant and equipment	(72,159)	(81,877)
Purchases of short-term investments	(13,959)	(9,744)
Proceeds from maturity of short-term investments	10,831	27,891
Other	1,235	(1,238)
Net cash and cash equivalents used in investing activities	(74,093)	(64,968)
Cash flows from financing activities
Advances on lines of credit and short-term debt	9,151	2,383
Taxes paid related to net share settlement	(11,056)	(277)
Proceeds from long-term debt	304,656	7,500
Repayments of long-term debt	(408,863)	(109,607)
Net proceeds from issuance of common stock	4,861	6,880
Proceeds from capital lease obligation	1,489
Repayment of capital lease obligation		(533)
Dividend distribution to noncontrolling interest	(2,694)	(5,754)
Capital contribution from noncontrolling interest	5,263
Other	(764)	1,562
Net cash and cash equivalents used in financing activities	(97,957)	(97,846)
Effect of exchange rate changes on cash and cash equivalents	(6,039)	9,415
Change in cash and cash equivalents, including restricted cash	(54,161)	(47,059)
Cash and cash equivalents, beginning of period, including restricted cash	205,262	249,712
Cash and cash equivalents, end of period, including restricted cash	151,101	202,653
Supplemental Cash Flow Information
Interest	7,661	10,063
Taxes	29,435	28,808
Non-cash investing and financing activities:
Decrease/(increase) in accounts payable related to the purchase of property, plant and equipment	$ 8,093	(10,919)
Noncontrolling Interest
Non-cash investing and financing activities:
Increase in dividend accrued for noncontrolling interest		$ 1,000