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Earnings Per Share (Details)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Basic weighted average common shares outstanding 134,187,169 132,306,735
Effect of dilutive securities - stock options and restricted stock 2,860,541 2,686,322
Diluted weighted average common shares outstanding 137,047,710 134,993,057
Common shares issuable upon the exercise of stock options
   
Anti-dilutive shares excluded from the calculation of diluted earnings per share    
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares) 1,200,000 2,700,000