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Basis of Presentation (Details 2) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stock option and restricted stock unit activity, including both continuing and discontinued operations    
Stock-based compensation expense recognized in operating expenses$ 1,230,000$ 432,000$ 3,524,000$ 1,017,000
Tax benefit of stock-based compensation expense in provision for income taxes449,000148,0001,267,000318,000
Stock-based compensation expense, net of tax781,000284,0002,257,000699,000
Fair value of shares vested1,287,000434,0003,405,000995,000
Proceeds to the Company from the exercise of stock-based compensation 23,000154,000978,000
Tax effect from exercise of stock-based compensation, including shortfall tax benefits (35,000)(71,000)(118,000)
Stock-based compensation cost capitalized in inventory  166,00023,000
Fair value of financial instruments    
United States Treasury securities and money market funds included in cash equivalents164,200,000 164,200,000 
Income Taxes    
Effective tax rate (as a percent)34.20%37.00%37.10%38.40%
Provision for income taxes$ 10,052,000$ 10,801,000$ 27,069,000$ 30,704,000
1994 Plan
    
Stock-Based Compensation    
Number of grants generally made annually under stock option plans  Once 
Requisite service period for options to vest (in years)  4 
Expiration period for options granted (in years)  7 
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity (in years)  60 
1995 Plan
    
Stock-Based Compensation    
Number of grants generally made annually under stock option plans  Once 
2011 Plan
    
Stock-Based Compensation    
Maximum common stock shares that may be sold under plan (in shares)16.3 16.3