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Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 136,164,053 135,222,411 135,983,603 134,803,784
Effect of dilutive securities - stock options and restricted stock 1,244,051 2,375,393 1,347,851 2,802,227
Diluted weighted average common shares outstanding 137,408,104 137,597,804 137,331,454 137,606,011
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) 3,400,000 1,200,000   1,200,000