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Share-Based Compensation (Schedule of Employee Stock Options and Restricted Stock Units) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares outstanding, beginning balance 6,527,000    
Weighted average exercise price outstanding, beginning balance $ 14.16 $ 13.61  
Number of shares, granted 592,829 601,897  
Weighted average exercise price, granted $ 16.00    
Number of shares, exercised (1,444,000)    
Weighted average exercise price, exercised $ 11.53    
Number of shares, forfeited and cancelled (82,000)    
Weighted average exercise price, forfeited and cancelled $ 18.90    
Number of shares, expired (261,000)    
Weighted average exercise price, expired $ 17.64    
Number of shares outstanding, ending balance 5,333,000 6,527,000  
Weighted average exercise price outstanding, ending balance $ 14.16 $ 13.61  
Weighted average remaining contractual term outstanding, ending balance 4 years 1 month 2 days    
Aggregate intrinsic value outstanding, ending balance $ 25,006    
Number of shares exercisable, ending balance 4,252,000 5,500,000 6,400,000
Weighted average exercise price exercisable, ending balance $ 13.18 $ 12.37 $ 12.93
Weighted average remaining contractual term exercisable, ending balance 2 years 10 months 28 days    
Aggregate intrinsic value exercisable, ending balance 23,664    
Number of shares vested and expected to vest, ending balance 5,257,000    
Weighted average exercise price vested and expected to vest, ending balance $ 14.12    
Weighted average remaining contractual term vested and expected to vest, ending balance 4 years 0 months 4 days    
Aggregate intrinsic value vested and expected to vest, ending balance 24,886    
Restricted Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining contractual term outstanding, ending balance 2 years 10 months 6 days    
Number of shares outstanding, beginning balance 5,651,000    
Restricted stock units, granted 2,574,000    
Restricted stock units vested (831,000)    
Restricted stock units, forfeited and cancelled (473,000)    
Number of shares outstanding, ending balance 6,921,000    
Aggregate intrinsic value outstanding, ending balance 125,602    
Number of shares vested and expected to vest, ending balance 5,732,000    
Weighted average contractual term vested and expected to vest, ending balance 2 years 8 months 26 days    
Aggregate intrinsic value vested and expected to vest, ending balance $ 104,029