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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Options Outstanding

The following table summarizes stock options outstanding and changes for the six-month periods ending June 30, 2017 and 2016:

    June 30,   June 30,
    2017   2016
    Number of Stock Options   Weighted Average Exercise Price   Number of Stock Options   Weighted Average Exercise Price
Stock options outstanding at beginning of period   110,828   $           18.24   326,424   $           24.90
Expired   (5,583)   11.04   (4,724)   438.89
Stock options outstanding at end of period   105,245   $           18.62   321,700   $           18.82
Stock options exercisable at end of period   105,139   $           18.60   321,491   $           18.81
Summary of Stock Options Outstanding and Exercisable by Stock Option Plan

The following table summarizes stock options outstanding and exercisable by stock option plan at June 30, 2017:

    Outstanding Stock Options   Exercisable Stock Options
Stock Option Plan   Number of Outstanding Stock Options   Weighted Average Exercise  Price  

Number of

Exercisable

Stock Options

   Weighted Average Exercise  Price
2004 Plan   4,792   $             35.14   4,792   $              35.14
2004 Directors’ Plan   1,390   629.52   1,390   629.52
2013 Plan   417   35.88   312   35.88
Replacement Stock Options   98,646   9.13   98,645   9.23
    105,245   $               18.62   105,139   $               18.60
Summary of Status of Non-vested Restricted Shares

The following table summarizes RSU activity for the six-month periods ended June 30, 2017 and 2016:

    June 30,   June 30,
    2017   2016
    Number of RSUs   Weighted-Average Grant Date Fair Value   Number of RSUs   Weighted-Average Grant Date Fair Value
Unvested RSUs at beginning of period   8,649   $           43.71   32,699   $           34.25
Forfeited   -   -   (3,334)   32.21
Vested   (3,625)   31.32   (7,698)   29.45
Unvested RSUs at end of period   5,024   $           52.64   21,667   $           36.27