CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$ 46,118	$ 31,328
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition, net of cash acquired	0	(124,916)
Purchases of property, plant and equipment	(11,817)	(15,954)
Proceeds from maturity of short-term investments	2,315	0
Proceeds from sale of equity securities	0	7,458
Other	1,695	160
Net cash used by investing activities	(7,807)	(133,252)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on line of credit	2,094	3,510
Repayments on lines of credit	(5,337)	(25,088)
Borrowings of long-term debt	0	180,000
Repayments of long-term debt	(17,277)	(10,269)
Net proceeds from issuance of common stock	280	59
Other	(82)	(2,936)
Net cash provided by (used by) financing activities	(20,322)	145,276
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(2,982)	(268)
INCREASE IN CASH AND CASH EQUIVALENTS	15,007	43,084
CASH AND CASH EQUIVALENTS, beginning of period	196,635	157,121
CASH AND CASH EQUIVALENTS, end of period	211,642	200,205
Non-cash financing activities:
Property, plant and equipment purchased on accounts payable	(547)	2,999
Acquisition:
Fair value of assets acquired	0	247,012
Liabilities assumed	0	92,277
Cash acquired	0	(29,819)
Net assets acquired	$ 0	$ 124,916