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Shareholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 10, 2013
Jun. 25, 2013
May 23, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 10, 2014
Subsequent Event [Member]
Dec. 31, 2013
Common Stock Buyback [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Time-based [Member]
Dec. 31, 2013
2007 Equity Compensation Plan [Member]
plans
Dec. 31, 2013
2007 Equity Compensation Plan [Member]
Tranche One [Member]
Dec. 31, 2013
2007 Equity Compensation Plan [Member]
Tranche Two [Member]
Dec. 31, 2013
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of active equity compensation plans                       1      
Number of shares available for grant       744,000               20,000,000      
Vesting rate                         50.00% 50.00%  
Stock options vesting period, years                     7 years        
Weighted average fair value of stock options granted       $ 10.45 $ 6.73 $ 5.70                  
Change in management estimate of stock-based compensation expense amortization       $ 19,637                      
Unrecognized compensation cost       37,266                      
Weighted average period for recognition of unrecognized compensation cost       2 years 6 months 22 days                      
Total options that were exercisable       14,601,000 9,760,000 11,680,000                  
Expiration date for options outstanding                 Dec. 14, 2014 Dec. 10, 2023          
Options outstanding weighted average remaining contractual life, years       5 years 8 months 16 days                      
Total intrinsic value of options exercised       47,392 19,565                    
Aggregate intrinsic value of options exercisable       223,061                      
Total intrinsic value of options outstanding       287,237                      
Share price       $ 34.73                      
Employee stock purchase plan, employee eligible percentage on offerings of common stock                             85.00%
Shares reserved under the plan                             15,600,000
Issuance of common stock under the employee stock purchase plan, shares                             11,658,000
Remaining stock repurchase authorization amount               81,070              
Rights received by common shareholder for each common share outstanding, rights       1                      
Series A Junior Participating Preferred stock, par value       $ 0.05 $ 0.05                    
Securities and assets of equivalent value, purchase price, per unit       $ 150                      
Number of days, rights become exercisable following public announcement       0 years 0 months 10 days                      
Acquiring Person, beneficial ownership of the outstanding common stock, minimum percentage       20.00%                      
Common shares received by holders upon surrender of rights, percentage       50.00%                      
Rights non-voting, redeemable days       0 years 0 months 10 days                      
Right redeemable price, per right       0.01                      
Dividends declared per common share $ 0.22   $ 0.20 $ 0.42 $ 0.63 $ 0.27                  
Dividends paid per common share   $ 0.20         $ 0.22                
Dividends declared       $ 71,665 $ 108,817 $ 48,558