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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash equivalents | $ 581,400 | $ 531,800 |  |
Provision to accounts receivable | $ 1,700 |  |  |
Anti-dilutive options to purchase common shares | 0.6 | 0.4 | 1.3 |
Compensation cost recognized for stock-based awards | $ 7,800 | $ 5,300 | $ 7,700 |
Income tax benefit recognized in the income statement for stock-based awards | 2,800 | 1,100 | $ 3,100 |
Weighted-average fair value per option granted |  |  | $ 8.76 |
Total cash received as a result of stock option exercises | 11,200 | 18,800 | $ 2,000 |
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards | 5,000 | 3,700 | 2,100 |
Total intrinsic value of stock options exercised | 7,700 | 5,100 | 700 |
Exchange losses related to foreign currency transactions | 2,100 | 500 | 2,300 |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification from cash flows from financing activities | (31,352) | (35,310) | 159,066 |
Reclassification to cash flows from operating activities | $ 145,842 | 273,088 | 147,375 |
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] | 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 | 15 years |  |  |
Maximum [Member] | Furniture And Fixtures [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful lives of the assets | 12 years |  |  |
Maximum [Member] | Vehicles [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful lives of the assets | 8 years |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification from cash flows from financing activities |  | 600 | 600 |
Reclassification to cash flows from operating activities |  | $ 600 | $ 600 |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Net cumulative effect adjustment |  |  |  | $ (200)
Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Net cumulative effect adjustment |  |  |  | $ 200
Accounting Standards Update 201409 [Member] | Preliminary assessment [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Effect of Change on Diluted Earnings Per Share | $ 0.02 | $ (0.02) |  |

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