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Condensed Consolidated 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 (used in) operating activities $ 4,941us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ (10,212)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Capital expenditures for property, plant and equipment (5,074)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,691)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures for intangible assets (39)us-gaap_PaymentsToAcquireIntangibleAssets (46)us-gaap_PaymentsToAcquireIntangibleAssets
Net proceeds from sale of assets 4,800us-gaap_ProceedsFromSaleOfProductiveAssets  
Purchase of debt securities (15,250)us-gaap_PaymentsToAcquireMarketableSecurities  
Net proceeds from sale of other investments   32us-gaap_ProceedsFromSaleOfOtherInvestments
Net cash used in investing activities (15,563)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,705)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Net proceeds from issuance of common shares 1,710us-gaap_ProceedsFromIssuanceOfCommonStock 5,542us-gaap_ProceedsFromIssuanceOfCommonStock
Changes in restricted cash 7,171us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities 4,502us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
Excess income tax benefit on employee stock-based awards 57us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 29us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by financing activities 8,938us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 10,073us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (5,347)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 37us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net decrease in cash and cash equivalents (7,031)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,807)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 36,815us-gaap_CashAndCashEquivalentsAtCarryingValue 28,924us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period $ 29,784us-gaap_CashAndCashEquivalentsAtCarryingValue $ 25,117us-gaap_CashAndCashEquivalentsAtCarryingValue