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6. Noncontrolling Interest (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Noncontrolling interests, beginning of period     $ 3,823,000  
Net loss attributable to noncontrolling interest (26,000) 564,000 (127,000) 1,095,000
Purchase of noncontrolling interests     (3,400,000)  
Currency fluctuations     (200,000)  
Noncontrolling interests, end of period $ 81,000   $ 81,000