Balance Sheet Information (Details 4) (USD $)	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Cost Method Investment
Carrying value of the investment	$ 19,400,000		$ 16,900,000
Customer Deposits and Deferred Revenue
Customer deposits	35,800,000		27,500,000
Accrued Warranty
Balance as of the beginning of period	5,662,000	4,942,000
Warranties issued during the period	2,536,000	2,778,000
Settlements made during the period	(3,160,000)	(3,315,000)
Changes in estimates during the period	259,000
Balance as of the end of period	$ 5,297,000	$ 4,405,000
Maximum
Cost Method Investment
Percentage ownership of cost method investee	20.00%

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

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Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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The percentage of ownership in the investee accounted for under the cost method of accounting.

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