Income Taxes (Summary Of Deferred Income Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	$ 5,297	$ 4,455
Deferred income tax asset - Non-current	14,056	13,670
Valuation allowance	(11,760)	(11,148)
Net deferred income tax asset - Non-current	2,296	2,522
Deferred tax liability, net	(1,148)	(1,161)
Intercompany Profit In Inventory [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	1,482	1,504
Warranty Costs [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	291	248
Bad Debt Reserve [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	120	112
Inventory Reserve [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	727	655
Unearned Service Revenue [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	1,997	1,787
Deferred income tax asset - Non-current	1,065	973
Other [Member]
Deferred Income Tax Asset [Line Items]
Net deferred income tax asset - Current	679	149
Depreciation [Member]
Deferred Income Tax Asset [Line Items]
Deferred income tax asset - Non-current	(779)	(186)
Goodwill Amortization [Member]
Deferred Income Tax Asset [Line Items]
Deferred income tax asset - Non-current	(1,508)	(1,342)
Product Design Costs [Member]
Deferred Income Tax Asset [Line Items]
Deferred income tax asset - Non-current	(87)	(61)
Employee Stock Option [Member]
Deferred Income Tax Asset [Line Items]
Deferred income tax asset - Non-current	426	202
Intangible Assets [Member]
Deferred Income Tax Asset [Line Items]
Deferred tax liability, net	(1,148)	(1,161)
Loss Carryforwards [Member]
Deferred Income Tax Asset [Line Items]
Deferred income tax asset - Non-current	$ 14,939	$ 14,084

The noncurrent portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws, before the valuation allowance, if any, to reduce such amount to net realizable value. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, is classified according to the expected reversal date of the temporary difference.

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The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset.

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- Definition

The noncurrent portion as of the balance sheet date of the aggregate carrying amount of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after the valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, is classified according to the expected reversal date of the temporary difference.

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- Definition

The allocated portion as of the balance sheet date of a valuation allowance pertaining to a deferred tax asset classified as noncurrent for which, based on the weight of available evidence, it is more likely than not, such asset will not be fully realized through future reductions of tax-based income.

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- Definition

Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference.

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