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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 years days | Dec. 31, 2010 | Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | $ 155,000,000 | $ 306,000,000 |
Long-term investments, par value | 28,000,000 |  |
Interest rate reset day (Minimum) | 7 |  |
Interest rate reset day (Maximum) | 35 |  |
Maturity term (Minimum), years | 10 |  |
Unrealized losses still held | 3,327,000 | 3,853,000 |
Unrealized gains on long-term Investments | 500,000 | 500,000 | 900,000
Options to purchase of common shares | 3,400,000 | 2,700,000 | 4,100,000
Total compensation cost recognized for stock-based awards | 5,100,000 | 5,400,000 | 5,400,000
Income tax benefit recognized in the income statement for stock-based awards | 1,700,000 | 1,900,000 | 1,800,000
Percentage of performance goal to be achieved for target number of shares to be vest | 100.00% |  |
Weighted-average grant date fair value, per option | $ 8.14 | $ 9.03 | $ 7.58
Total cash received as a result of stock option exercises | 2,571,000 | 3,252,000 | 3,602,000
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards | 900,000 | 1,300,000 | 900,000
Total intrinsic value of stock options exercised | 1,400,000 | 2,100,000 | 2,600,000
Targeted number of performance based restricted stock unit awards | 100,000 |  |
Expenses related to foreign currency translation | 1,500,000 | 2,400,000 | 1,900,000
Correction of an immaterial error, increase in cost of goods sold |  | 1,300,000 | 500,000
Correction of an immaterial error, decrease in net income |  | 1,300,000 | 500,000
Correction of an immaterial error, decrease in net income per share diluted |  | $ 0.02 | $ 0.01
Correction of an immaterial error, decrease in inventory |  | 700,000 | 500,000
Correction of an immaterial error, increase in accounts payable |  | 1,100,000 |
Correction of an immaterial error, decrease in retained earnings |  | 1,800,000 | 500,000
Buildings And Building Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets, minimum (years) | 5 |  |
Useful lives of the assets, maximum (years) | 40 |  |
Machinery And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets, minimum (years) | 2 |  |
Useful lives of the assets, maximum (years) | 10 |  |
Furniture And Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets, minimum (years) | 2 |  |
Useful lives of the assets, maximum (years) | 10 |  |
Vehicles [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets, minimum (years) | 2 |  |
Useful lives of the assets, maximum (years) | 5 |  |
Stock Options [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 4,200,000 |  |
Total unrecognized compensation cost, weighted-average recognition period, years | 1.7 |  |
Options issued | 400,000 | 61,000 | 600,000
Restricted Shares [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 3,800,000 |  |
Total unrecognized compensation cost, weighted-average recognition period, years | 2.6 |  |
Restricted Stock Units And Phantom Stock Awards [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 1,300,000 |  |
Total unrecognized compensation cost, weighted-average recognition period, years | 2.2 |  |
Performance Based Restricted Stock Units [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reversal of stock-based compensation expense. | 200,000 |  |
Total unrecognized compensation cost | 1,300,000 |  |
Total unrecognized compensation cost, weighted-average recognition period, years | 3.2 |  |
Auction Rate Securities [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Long-term investments, fair value | $ 24,700,000 |  |

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- Definition Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares newly issued during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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