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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2011 Water Star, Inc. [Member] | Jun. 30, 2012 Customer Lists and Service Contracts [Member] | Dec. 31, 2011 Customer Lists and Service Contracts [Member] | Jun. 30, 2012 Trade Name [Member] | Dec. 31, 2011 Trade Name [Member] | Jun. 30, 2012 Technology [Member] | Dec. 31, 2011 Technology [Member]
Goodwill Gross [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  | $ 66,523 |  |  |  |  |  |  |  |  |
Foreign currency fluctuations |  |  | (223) |  |  |  |  |  |  |  |  |
Balance, end of period | 66,300 |  | 66,300 |  |  |  |  |  |  |  |  |
Goodwill Accumulated Impairment Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  | (46,220) |  |  |  |  |  |  |  |  |
Foreign currency fluctuations |  |  | (250) |  |  |  |  |  |  |  |  |
Balance, end of period | (46,470) |  | (46,470) |  |  |  |  |  |  |  |  |
Goodwill Net [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  | 20,303 |  |  |  |  |  |  |  |  |
Foreign currency fluctuations |  |  | (473) |  |  |  |  |  |  |  |  |
Balance, end of period | 19,830 |  | 19,830 |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original cost | 35,113 |  | 35,113 |  | 37,706 |  | 23,562 | 25,987 | 4,492 | 4,583 | 7,059 | 7,136
Accumulated amortization | (12,915) |  | (12,915) |  | (13,948) |  | (9,064) | (10,387) | (1,347) | (1,209) | (2,504) | (2,352)
Carrying amount | 22,198 |  | 22,198 |  | 23,758 |  | 14,498 | 15,600 | 3,145 | 3,374 | 4,555 | 4,784
Weighted-average original life (in years) |  |  |  |  |  | 15 | 15 | 14 | 14 | 14 | 13 | 13
Amortization expense on Intangible Assets | 656 | 872 | 1,432 | 1,704 |  |  |  |  |  |  |  |
Estimated aggregate amortization expense of Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Remaining 2012 |  |  | 1,135 |  |  |  |  |  |  |  |  |
2013 |  |  | 2,285 |  |  |  |  |  |  |  |  |
2014 |  |  | 2,225 |  |  |  |  |  |  |  |  |
2015 |  |  | 2,214 |  |  |  |  |  |  |  |  |
2016 |  |  | 2,174 |  |  |  |  |  |  |  |  |
Thereafter |  |  | 12,165 |  |  |  |  |  |  |  |  |
Total |  |  | 22,198 |  |  |  |  |  |  |  |  |
Impairment loss on a customer list and technology intangible assets |  | $ 1,805 |  |  |  |  |  |  |  |  |  |

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