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Operations and Summary of Significant Accounting Policies - Stock Based Compensation (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation      
Document Fiscal Year Focus 2015    
Stock-based compensation activity, including both continuing and discontinued operations      
Stock-based compensation expense recognized in operating expenses $ 11,212 $ 12,299 $ 12,053
Tax benefit of stock-based compensation expense in provision for income taxes 3,987 4,384 4,225
Stock-based compensation expense, net of tax 7,225 7,915 7,828
Fair value of shares vested 10,997 12,354 12,090
Proceeds to the Company from the exercise of stock-based compensation 9,720 4,582 15,057
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits (318) (268) (2,645)
Stock-based compensation cost capitalized in inventory $ 368 $ 559 $ 463
1994 Plan      
Stock-Based Compensation      
Requisite service period for options to vest 4 years    
Expiration period for options granted 7 years    
2011 Plan      
Stock-Based Compensation      
Maximum common stock shares that may be issued under plan 16.3