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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net cash provided by operating activities $ 38,568us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 46,118us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES    
Decrease in restricted cash 486us-gaap_IncreaseDecreaseInRestrictedCash  
Purchases of property, plant and equipment (23,539)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (11,817)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of short-term investments (24,985)us-gaap_PaymentsToAcquireShortTermInvestments  
Proceeds from sale of equity securities and short-term investments 10,007us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 2,315us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
Other (148)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 1,695us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (38,179)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (7,807)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES    
Advances on lines of credit and short-term debt 965us-gaap_ProceedsFromLinesOfCredit 2,094us-gaap_ProceedsFromLinesOfCredit
Repayments on lines of credit and short-term debt (1,067)us-gaap_RepaymentsOfLinesOfCredit (5,337)us-gaap_RepaymentsOfLinesOfCredit
Repayments of long-term debt (23,071)us-gaap_RepaymentsOfBankDebt (17,277)us-gaap_RepaymentsOfBankDebt
Net proceeds from issuance of common stock 5,649us-gaap_ProceedsFromIssuanceOfCommonStock 280us-gaap_ProceedsFromIssuanceOfCommonStock
Other (88)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (82)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities (17,612)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (20,322)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (3,664)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (2,982)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (20,887)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 15,007us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period 243,000us-gaap_CashAndCashEquivalentsAtCarryingValue 196,635us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period 222,113us-gaap_CashAndCashEquivalentsAtCarryingValue 211,642us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash financing activities:    
Property, plant and equipment purchased on accounts payable $ (10,281)us-gaap_CapitalExpendituresIncurredButNotYetPaid $ (547)us-gaap_CapitalExpendituresIncurredButNotYetPaid