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Acquisitions and Divestitures (Details) (Water Star, Inc. [Member], USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2011 | May 31, 2011
Water Star, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date of acquisition | 2011-05-31 |  |
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 |
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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