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Share-Based Compensation (Schedule of Employee Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of shares outstanding, beginning balance 1,821    
Number of shares, exercised (354)    
Number of shares, forfeited (3)    
Number of shares, expired (25)    
Number of shares outstanding, ending balance 1,439    
Number of shares exercisable, ending balance 1,439 1,700 2,100
Number of shares vested and expected to vest, ending balance 1,439    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Weighted average exercise price outstanding, beginning balance (dollars per share) $ 19.37    
Weighted average exercise price, exercised (dollars per share) 17.66    
Weighted average exercise price, forfeited (dollars per share) 18.68    
Weighted average exercise price, expired (dollars per share) 16.21    
Weighted average exercise price outstanding, ending balance (dollars per share) 19.84    
Weighted average exercise price exercisable, ending balance (dollars per share) 19.84 $ 19.27 $ 18.10
Weighted average exercise price vested and expected to vest, ending balance (dollars per share) $ 19.84    
Weighted average remaining contractual term outstanding, ending balance (in years) 3 years 10 months 6 days    
Weighted average remaining contractual term vested, ending balance (in years) 3 years 10 months 6 days    
Weighted average remaining contractual term vested and expected to vest, ending balance (in years) 3 years 10 months 6 days    
Aggregate intrinsic value outstanding, ending balance $ 11,762    
Aggregate intrinsic value vested, ending balance 11,762    
Aggregate intrinsic value vested and expected to vest, ending balance $ 11,762    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of shares outstanding, beginning balance 8,956    
Restricted stock units, granted (in shares) 2,942    
Restricted stock units vested (in shares) (1,200)    
Restricted stock units, forfeited (in shares) (500)    
Number of shares outstanding, ending balance 10,198    
Number of shares vested and expected to vest, ending balance 8,886    
Weighted average contractual term vested, outstanding (in years) 2 years 5 months 5 days    
Weighted average contractual term vested and expected to vest (in years) 2 years 3 months 18 days    
Aggregate intrinsic value outstanding, ending balance $ 285,311    
Aggregate intrinsic value vested and expected to vest, ending balance $ 248,989