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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following is a reconciliation of the average shares outstanding used to compute basic and diluted earnings per share:
|  | 2015 |  | 2014 |  | 2013
Basic weighted average common shares outstanding |  | 136,036,192 |  |  | 134,934,892 |  |  | 132,894,179 |
Effect of dilutive securities - stock awards |  | 1,397,623 |  |  | 2,416,417 |  |  | 2,436,014 |
Diluted weighted average common shares outstanding |  | 137,433,815 |  |  | 137,351,309 |  |  | 135,330,193 |
For the years ended December 31, 2015, 2014, and 2013, 2.8 million, 1.2 million, and 2.3 million, respectively, of common shares issuable upon the exercise of stock options were anti-dilutive and were excluded from the calculation of diluted earnings per share.

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