CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$ 52,951	$ 80,066
CASH FLOWS FROM INVESTING ACTIVITIES
Decrease (increase) in restricted cash	(2,611)	972
Purchases of property, plant and equipment	(46,877)	(23,668)
Proceeds from sales of property, plant, and equipment	19	1,428
Purchases of equity securities	(3,241)	(1,842)
Purchases of short-term investments	(35,095)
Proceeds from sale of equity securities and short-term investments	21,135	5,380
Other	(94)	308
Net cash used in investing activities	(66,764)	(17,422)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on lines of credit and short-term debt	1,449	4,335
Repayments on lines of credit and short-term debt	(1,550)	(7,622)
Repayments of long-term debt	(41,145)	(20,710)
Net proceeds from issuance of common stock	8,274	2,913
Other	(139)	(147)
Net cash used in financing activities	(33,111)	(21,231)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(1,484)	(2,583)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(48,408)	38,830
CASH AND CASH EQUIVALENTS, beginning of period	243,000	196,635
CASH AND CASH EQUIVALENTS, end of period	194,592	235,465
Non-cash financing activities:
Property, plant and equipment purchased on accounts payable	$ (18,963)	$ (1,968)