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Accounting for Stock-Based Compensation - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Stock-Based Compensation          
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount     $ 2,000    
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation expense recognized in operating expenses $ 2,991 $ 3,264 6,075 $ 5,740  
Less: Tax benefit of stock-based compensation expense in provision for income taxes 1,082 1,163 2,139 2,073  
Stock-based compensation expense, net of tax 1,909 2,101 3,936 3,667  
Fair value of shares vested 3,211 3,312 5,995 5,691  
Proceeds to the Company from the exercise of stock-based compensation 92 857 5,576 2,626  
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (2) (51) (186) (186)  
Fair value of financial instruments          
United States Treasury securities and money market funds included in cash equivalents 92,875 96,996 92,875 96,996 $ 99,024
Income Taxes          
Income (Loss) from Operations $ 35,009 $ 32,133 $ 51,286 $ 51,738  
Effective tax rate (as a percent) 38.50% 36.30% 38.40% 37.20%  
Provision for income taxes $ 13,446 $ 11,667 $ 19,637 $ 19,271  
Stock Compensation Plan          
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation cost capitalized in inventory $ 500 $ 508 $ 500 $ 508  
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