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Basis of Presentation (Details 3) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock-based compensation activity, including both continuing and discontinued operations        
Stock-based compensation expense recognized in operating expenses $ 1,966,000 $ 1,230,000 $ 7,086,000 $ 3,524,000
Tax benefit of stock-based compensation expense in provision for income taxes 691,000 449,000 2,462,000 1,267,000
Stock-based compensation expense, net of tax 1,275,000 781,000 4,624,000 2,257,000
Fair value of shares vested 2,043,000 1,287,000 7,048,000 3,405,000
Proceeds to the Company from the exercise of stock-based compensation 201,000   2,184,000 154,000
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits (4,000)   (60,000) (71,000)
Stock-based compensation cost capitalized in inventory     354,000 166,000
Fair value of financial instruments        
United States Treasury securities and money market funds included in cash equivalents 85,200,000   85,200,000  
Income Taxes        
Effective tax rate (as a percent) 41.40% 34.20% 42.60% 37.10%
Provision for income taxes $ 9,069,000 $ 10,052,000 $ 26,788,000 $ 27,069,000
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   16.3