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Basis of Presentation (Details 3) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation expense recognized in operating expenses $ 2,959,000 $ 1,966,000 $ 8,644,000 $ 7,086,000  
Tax benefit of stock-based compensation expense in provision for income taxes 1,087,000 691,000 3,031,000 2,462,000  
Stock-based compensation expense, net of tax 1,872,000 1,275,000 5,613,000 4,624,000  
Fair value of shares vested 3,007,000 2,043,000 8,656,000 7,048,000  
Proceeds to the Company from the exercise of stock-based compensation 4,557,000 201,000 5,333,000 2,184,000  
Tax effect from exercise of stock-based compensation, including shortfall tax benefits (337,000) (4,000) (2,187,000) (60,000)  
Fair value of financial instruments          
United States Treasury securities and money market funds included in cash equivalents 87,381,000 85,237,000 87,381,000 85,237,000 76,130,000
Income Taxes          
Non-deductible acquisition costs         2,300,000
Effective tax rate (as a percent) 35.20% 41.10% 37.80% 42.60%  
Provision for income taxes 10,870,000 9,069,000 26,304,000 26,788,000  
Stock Compensation Plan
          
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation cost capitalized in inventory $ 426,000 $ 354,000 $ 426,000 $ 354,000  
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