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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Liabilities [Abstract]      
Net (loss) gain on foreign currency forward exchange contracts $ (1,444) $ 1,216 $ (2,932)
Notional amounts of foreign currency forward exchange contracts 45,524 40,325  
Fair Value, Measurements, Nonrecurring [Member]
      
Liabilities [Abstract]      
Total Liabilities   420  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]
      
Assets [Abstract]      
Water Star technology 3,800 [1]    
Foreign currency forward exchange contracts 1,015 [2]    
Total Assets 4,815    
Liabilities [Abstract]      
Foreign currency forward exchange contracts 102 [2]    
Total Liabilities 102    
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
      
Assets [Abstract]      
Foreign currency forward exchange contracts 0 [2]    
Total Assets 0    
Liabilities [Abstract]      
Foreign currency forward exchange contracts 0 [2]    
Total Liabilities 0    
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
      
Assets [Abstract]      
Foreign currency forward exchange contracts 1,015 [2]    
Total Assets 1,015    
Liabilities [Abstract]      
Foreign currency forward exchange contracts 102 [2]    
Total Liabilities 102    
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
      
Assets [Abstract]      
Water Star technology 3,800 [1]    
Total Assets 3,800    
Liabilities [Abstract]      
Foreign currency forward exchange contracts 0 [2]    
Total Liabilities $ 0    
[1] We used a loss of income method to value Water Star technology. Inputs for this valuation model were based on estimated costs to replace and hypothetical lost profits.
[2] Our foreign currency forward exchange contracts are valued based on quoted forward foreign exchange prices at the reporting date.