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Basis of Presentation (Details 3) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Stock-based compensation activity, including both continuing and discontinued operations      
Stock-based compensation expense recognized in operating expenses $ 2,879,000 $ 3,068,000  
Tax benefit of stock-based compensation expense in provision for income taxes 1,137,000 1,066,000  
Stock-based compensation expense, net of tax 1,742,000 2,002,000  
Fair value of shares vested 2,813,000 3,110,000  
Proceeds to the Company from the exercise of stock-based compensation 496,000 1,758,000  
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits (1,843,000) (2,000)  
Stock-based compensation cost capitalized in inventory 361,000 387,000  
Fair value of financial instruments      
United States Treasury securities and money market funds included in cash equivalents 59,074,000 69,987,000 76,130,000
Income Taxes      
Foreign losses, primarily from the European segment 3,500,000    
Effective tax rate (as a percent) 47.00% 46.90%  
Provision for income taxes $ 4,256,000 $ 6,372,000  
1994 Plan
      
Stock-Based Compensation      
Requisite service period for options to vest 4 years    
Expiration period for options granted 7 years    
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity 60 years    
2011 Plan
      
Stock-Based Compensation      
Maximum common stock shares that may be issued under plan 16.3