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Accounting for Stock-Based Compensation - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation expense recognized in operating expenses $ 2,794 $ 3,041 $ 8,869 $ 8,781  
Less: Tax benefit of stock-based compensation expense in provision for income taxes 1,005 1,075 3,144 3,142  
Stock-based compensation expense, net of tax 1,789 1,966 5,725 5,639  
Fair value of shares vested 2,749 3,098 8,744 8,789  
Proceeds to the Company from the exercise of stock-based compensation 1,443 1,551 7,019 4,178  
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (58) (89) (244) (275)  
Fair value of financial instruments          
Financial instruments $ 76,488 $ 98,568 76,488 $ 98,568 $ 99,024
Income Taxes          
Year to date operating losses for which no tax benefit was recorded     $ 2,600    
Effective tax rate (as a percent) 38.40% 36.00% 38.40% 36.70%  
Provision for income taxes $ 13,479 $ 11,577 $ 33,115 $ 30,849  
Stock Compensation Plan          
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation cost capitalized in inventory $ 464 $ 525 $ 464 $ 525  
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