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Shareholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended
May 21, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Common Stock Buyback [Member]
Jun. 30, 2014
2007 Plan [Member]
Tranche One [Member]
Jun. 30, 2014
2007 Plan [Member]
Tranche Two [Member]
Jul. 22, 2014
Subsequent Event [Member]
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting rate             50.00% 50.00%  
Unrecognized compensation cost   $ 33,865   $ 33,865          
Total intrinsic value of options exercised       50,471          
Aggregate intrinsic value of options exercisable   158,021   158,021          
Share Price   $ 32.77   $ 32.77          
Weighted average exercise price per share   $ 19.57   $ 19.57          
Total options that were outstanding   20,994,000   20,994,000          
Total options that were exercisable   11,974,000   11,974,000          
Shares purchased and retired           4,261,000      
Company purchased, cost           140,568      
Remaining stock repurchase authorization amount                 140,502
Dividends declared per common share $ 0.22 $ 0.22 $ 0.20 $ 0.22 $ 0.20        
Cash dividends declared on the Company's common stock       $ 36,942 $ 34,400