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Basis of Presentation (Details 5) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation expense recognized in operating expenses $ 3,264 $ 2,807 $ 5,740 $ 5,686  
Tax benefit of stock-based compensation expense in provision for income taxes 1,163 896 2,073 1,944  
Stock-based compensation expense, net of tax 2,101 1,911 3,667 3,742  
Fair value of shares vested 3,312 2,836 5,691 5,649  
Proceeds to the Company from the exercise of stock-based compensation 857 280 2,626 776  
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (51) (7) (186) (1,850)  
Fair value of financial instruments          
United States Treasury securities and money market funds included in cash equivalents 96,996 60,725 96,996 60,725 117,571
Income Taxes          
Effective tax rate (as a percent) 36.30% 37.70% 37.20% 39.80%  
Provision for income taxes 11,667 11,177 19,271 15,434  
Stock Compensation Plan
          
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation cost capitalized in inventory $ 508 $ 384 $ 508 $ 384  
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