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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Percentage of Weighted Average Cost Inventory |  | 43.00% | 44.00% |
Impairment of Long-Lived Assets Held-for-use |  | $ 0 | $ 0 | $ 0
Goodwill, Impairment Loss | $ 80,337 | 80,337 | 0 | 0
Goodwill, Impairment Loss, Net of Tax | $ 63,887 | 63,887 |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 0 |  |
Product warranty reserves |  | 8,755 | 11,500 |
Foreign currency transaction gains |  | 1,616 | 422 | 433
Research and Development Expense |  | 3,937 | 3,096 | $ 3,154
Deferred Tax Assets, Gross, Noncurrent |  | 226 | 93 |
Deferred Income Tax Liabilities |  | 8,926 | 7,618 |
Accounting Standards Update 2015-17 [Member] |  |  |  |
Deferred Tax Assets, Gross, Noncurrent |  |  | 3,497 |
Deferred Income Tax Liabilities |  |  | 77 |
Non-Domestic [Member] |  |  |  |
Certificates of Deposit, at Carrying Value |  | 1,939 | 25 |
Cash, Cash Equivalents, and Short-term Investments |  | $ 29,700 | $ 49,233 |
Maximum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 25 years |  |
Maximum [Member] | Building [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 13 years |  |
Minimum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 5 years |  |
Minimum [Member] | Building [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Weighted Average [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 14 years |  |

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