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Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
Schedule of reconciliation of changes in common shares issued | A reconciliation of changes in common shares issued during the six months ended June 30, 2017 is as follows:
Shares issued at December 31, 2016 | 59,684,669 |
Issued as restricted stock award grants | 168,756 |
Issued upon exercise of stock options | 651,188 |
Shares issued at June 30, 2017 | 60,504,613 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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