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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]        
Valuation allowance reversed $ 17,000 $ 3,000   $ 3,000
Non-cash income tax benefit from reversal of valuation allowance 6,221 1,162    
Increase (decrease) in deferred income tax assets valuation allowance     (25,892) (4,054)
Deferred income tax assets   24,761 17,829 24,761
Net operating loss carryforwards   24,761 17,829 24,761
Loss carryforwards, U.S. federal income tax purposes   65,121 44,255 65,121
Loss carryforwards, U.S. state income tax purposes   45,090 44,196 45,090
Loss carryforwards, U.S. foreign income tax purposes   292 433 292
Excess tax deduction for exercise of stock options     12,339  
Increase (decrease) in ASC 740 reserve     (12) 110
Unremitted earnings of foreign subsidiaries     7,128  
Decrease of unrecognized tax benefits     36 (77)
Tax years subject to examination    

       The principal tax jurisdictions in which the Company files income tax returns are the United States, France, Germany, Japan, India, Italy, Switzerland, Australia, the Netherlands and the United Kingdom. Tax years 2008 through 2011 remain subject to examination by the U.S. Internal Revenue Service. The Company has utilized a portion of its U.S. loss carryforwards causing the years from 1997 through 2003 to be subject to examination. Should the Company utilize any of its remaining U.S. loss carryforwards, its remaining losses, which date back to 2003, would be subject to examination. The Company's non-U.S. subsidiaries' tax returns are open to possible examination beginning in the year shown in parentheses in the following countries: France (2004), Germany (2006), Japan (2005), Italy (2006), Switzerland (2005), the United Kingdom (2007), the Netherlands (2006) and Australia (2007).

  
Non-U.S. subsidiaries tax returns and years subject to examination     France (2004), Germany (2006), Japan (2005), Italy (2006), Switzerland (2005), the United Kingdom (2007), the Netherlands (2006) and Australia (2007).  
U.S. Deferred Tax Assets [Member]
        
Income Taxes [Line Items]        
Increase (decrease) in deferred income tax assets valuation allowance     (25,892) (4,059)
Foreign Deferred Tax Assets [Member]
        
Income Taxes [Line Items]        
Increase (decrease) in deferred income tax assets valuation allowance       5
U.S. Federal Income Tax [Member]
        
Income Taxes [Line Items]        
Net operating loss carryforwards   110,503 88,884 110,503
Operating loss carryforwards, expiration beginning period     2024  
Research and experimentation tax credit carryforwards   3,050 3,307 3,050
Alternative minimum tax credit carryforwards   474 474 474
U.S. State Income Tax [Member]
        
Income Taxes [Line Items]        
Operating loss carryforwards, expiration beginning period     2012  
Research and experimentation tax credit carryforwards   2,135 2,040 2,135
Other tax credits   518 615 518
U.S. State Income Tax [Member] | Foreign Deferred Tax Assets [Member]
        
Income Taxes [Line Items]        
Increase (decrease) in deferred income tax assets valuation allowance     $ 8,690  
Foreign Income Tax [Member]
        
Income Taxes [Line Items]        
Operating loss carryforwards, expiration beginning period     2018  
Federal And State Income Tax [Member]
        
Income Taxes [Line Items]        
Other federal and state tax credits expiration beginning period     2012 2012