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Stock-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options        
Number of Shares        
Options outstanding at the beginning of the period (in shares)   3,630,000    
Options granted (in shares)   716,000    
Options exercised (in shares)   (603,000)    
Options forfeited (in shares)   (47,000)    
Options expired (in shares)   (90,000)    
Options outstanding at the end of the period (in shares)   3,606,000 3,630,000  
Exercisable at the end of the period (in shares)   2,629,000    
Vested and expected to vest at the end of the period (in shares)   3,543,000    
Weighted-Average Exercise Price        
Options outstanding at the beginning of the period (in dollars per share)   $ 23.80    
Options granted (in dollars per share)   26.98    
Options exercised (in dollars per share)   19.66    
Options forfeited (in dollars per share)   28.23    
Options expired (in dollars per share)   23.88    
Options outstanding at the end of the period (in dollars per share)   25.07 $ 23.80  
Exercisable at the end of the period (in dollars per share)   23.91    
Vested and expected to vest at the end of the period (in dollars per share)   $ 25.02    
Weighted-Average Remaining Contractual Life        
Options outstanding at the end of the period   5 years 4 months 24 days    
Exercisable at the end of the period   4 years 2 months 12 days    
Vested and expected to vest at the end of the period   5 years 4 months 24 days    
Aggregate Intrinsic Value        
Options outstanding at the end of the period (in dollars)   $ 17,518    
Exercisable at the end of the period (in dollars)   15,815    
Vested and expected to vest at the end of the period (in dollars)   17,403    
Intrinsic value (in dollars)   5,600 $ 6,600 $ 8,200
Fair value of shares vested (in dollars)   $ 5,300 $ 4,200 $ 6,000
Stock Options | Performance-Based Vesting        
Number of Shares        
Options granted (in shares) 75,531      
Weighted-Average Exercise Price        
Options exercised (in dollars per share) $ 31.12      
Nonstatutory Stock Options | Outside directors        
Additional disclosure related to options        
Exercise price as a percentage of the fair market value of the company's stock   100.00%    
Minimum | Incentive Stock Options        
Additional disclosure related to options        
Exercise price as a percentage of the fair market value of the company's stock   100.00%    
Minimum | Nonstatutory Stock Options        
Additional disclosure related to options        
Exercise price as a percentage of the fair market value of the company's stock   80.00%    
Maximum | Incentive Stock Options        
Additional disclosure related to options        
Term of incentive stock options from the date of grant   10 years    
Maximum | Nonstatutory Stock Options | Outside directors        
Additional disclosure related to options        
Term of stock options after termination of the outside directors' service   12 months    
End of first year | Nonstatutory Stock Options | Outside directors        
Additional disclosure related to options        
Vesting percentage   25.00%    
Vesting period, after the first anniversary, in which the options vest monthly   3 years