Earnings Per Share (Details) 1
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Weighted average number of shares used in computing basic EPS 206,938,789 205,975,724 206,733,127 205,782,438
Add dilutive common stock equivalents:        
Outstanding stock options and restricted stock units 372,062 [1] 648,708 [1] 473,995 [1] 752,705 [1]
Weighted average number of shares used in computing diluted EPS 207,310,851 206,624,432 207,207,122 206,535,143
[1] Excludes 2,240,802 and 792,881 common stock equivalents for the three months ended June 30, 2014 and 2013 because their effect was anti-dilutive. Excludes 1,802,512 and 443,065 common stock equivalents for the six months ended June 30, 2014 and 2013 because their effect was anti-dilutive.