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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | $ 247,000,000 | $ 286,100,000 |
Long-term investments | 11,400,000 |  |
Unrealized losses still held | 1,433,000 | 1,851,000 |
Fair value of auction rate securities | 9,900,000 |  |
Unrealized gains on long-term Investments | 400,000 | 1,500,000 | 500,000
Options to purchase of common shares | 1.2 | 3.7 | 3.4
Compensation cost recognized for stock-based awards | 7,100,000 | 6,300,000 | 5,100,000
Income tax benefit recognized in the income statement for stock-based awards | 2,600,000 | 2,100,000 | 1,700,000
Stock options issued | 0.3 | 0.4 | 0.4
Total cash received as a result of stock option exercises | 11,203,000 | 4,657,000 | 2,571,000
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards | 2,200,000 | 1,300,000 | 900,000
Total intrinsic value of stock options exercised | 3,200,000 | 1,400,000 | 1,400,000
Expenses related to foreign currency translation | 900,000 | 1,200,000 | 1,500,000
Stock Options [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 3,839,000 |  |
Remaining weighted-average amortization period | 2 years 2 months 12 days |  |
Weighted-average fair value per option granted | $ 7.87 | $ 6.83 | $ 8.14
Restricted Shares [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 2,166,000 |  |
Remaining weighted-average amortization period | 1 year 9 months 18 days |  |
Restricted Stock Units And Phantom Stock Awards [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | 4,081,000 |  |
Remaining weighted-average amortization period | 2 years 9 months 18 days |  |
Performance Based Restricted Stock Units [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total unrecognized compensation cost | $ 1,565,000 |  |
Remaining weighted-average amortization period | 2 years 2 months 12 days |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Interest rate reset period | 7 days |  |
Maturity term | 10 years |  |
Minimum [Member] | Buildings And Building Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 5 years |  |
Minimum [Member] | Machinery And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Minimum [Member] | Furniture And Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Minimum [Member] | Vehicles [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Interest rate reset period | 35 days |  |
Maximum [Member] | Buildings And Building Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 40 years |  |
Maximum [Member] | Machinery And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 10 years |  |
Maximum [Member] | Furniture And Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 10 years |  |
Maximum [Member] | Vehicles [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 5 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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