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Hedging Activities And Financial Instruments (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Foreign currency derivative contracts | $ 0 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure | $ 0 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure |  |
Foreign currency gain (loss) | (5,727,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (773,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 145,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
Interest rate | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |
Senior Convertible Notes Due December 15, 2016 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Debt maturity date | Dec. 15, 2016 |  |  |
Interest rate | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Principal amount of convertible notes |  |  |  | $ 152,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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