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Earnings Per Share (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 134,990,382 132,999,781 134,590,994 132,655,172
Effect of dilutive securities - stock options and restricted stock 2,436,260 2,112,949 2,829,485 2,374,272
Diluted weighted average common shares outstanding 137,426,642 135,112,730 137,420,479 135,029,444
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) 800,000 2,300,000 1,200,000 2,700,000