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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | May 31, 2011
Business Acquisition [Line Items] |  |
Date of acquisition | May 31, 2011 |
Total purchase price |  | $ 4,456
Cash paid as part of purchase price | 2,956 |
Number of payments to be made in future in acquisition | 2 |
Amount of each installment payments | 750 |
Water Star, Inc. [Member] |  |
Purchase price allocation [Abstract] |  |
Current Assets |  | 426
Property, plant and equipment, net |  | 167
Identified Intangible Assets |  | 3,800
Goodwill |  | 472
Total Assets Acquired |  | 4,865
Current Liabilities |  | 409
Total Liabilities Assumed |  | 409
Net Assets Acquired |  | $ 4,456

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