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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | $ 131,700 | $ 154,400 |
Provision for doubtful accounts | $ 2,160 | $ 8,608 | $ 1,712
Leases [Abstract] |  |  |
Lease, Practical Expedients, Package [true false] | true |  |
Lessee Operating Lease Option To Extend | Lease terms include options to extend or terminate the lease when it is reasonably certain that those options will be exercised. |  |
Lessee, Operating Lease, Option to Terminate | Lease terms include options to extend or terminate the lease when it is reasonably certain that those options will be exercised. |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |
Lessee, Operating Lease, Existence of Option to Terminate [true false] | true |  |
Anti-dilutive securities to purchase common shares | 0.1 | 0.1 | 0.1
Compensation cost recognized for stock-based awards | $ 10,400 | $ 10,200 | $ 10,100
Future tax benefit of stock-based awards as of grant date | 2,400 | 2,400 | 2,400
Total cash received as a result of stock option exercises | 1,000 | 1,600 | 3,600
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards | 2,100 | 2,300 | 2,500
Total intrinsic value of stock options exercised | 500 | 700 | 2,300
Exchange losses related to foreign currency transactions | $ 1,800 | $ 1,700 | $ 1,000
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 |  |

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