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Operations and Summary of Significant Accounting Policies - Stock Based Compensation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation activity, including both continuing and discontinued operations      
Stock-based compensation expense recognized in operating expenses $ 13,113 $ 11,212 $ 12,299
Tax benefit of stock-based compensation expense in provision for income taxes 4,757 3,987 4,384
Stock-based compensation expense, net of tax 8,356 7,225 7,915
Fair value of shares vested 13,186 10,997 12,354
Proceeds to the Company from the exercise of stock-based compensation 7,976 9,720 4,582
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits (251) (318) (268)
Stock-based compensation cost capitalized in inventory $ 434 $ 368 $ 559
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 150,000    
2011 Plan | Stock Options      
Stock-Based Compensation      
Maximum common stock shares that may be issued under plan 16,300,000    
2011 Plan | Restricted Stock Units      
Stock-Based Compensation      
Maximum common stock shares that may be issued under plan 100,000