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Share-Based Compensation - Summary of Stock Option Activity (Details)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Summary of stock option activity  
Options outstanding, Beginning Balance (shares) 247,590
Exercised (shares) (54,076)
Forfeited or Expired (shares) (129,741)
Options outstanding, Ending Balance (shares) 63,773
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Options Outstanding, Beginning Balance, Weighted Average Exercise Price (USD per share) | $ / shares $ 17.82
Exercised, Weighted Average Exercise Price (USD per share) | $ / shares 16.62
Forfeited or Expired, Weighted Average Exercise Price (USD per share) | $ / shares 18.91
Options Outstanding, Ending Balance, Weighted Average Exercise Price (USD per share) | $ / shares $ 16.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options outstanding, Beginning Balance, Options Exercisable (shares) 247,590
Options outstanding, Ending Balance, Options Exercisable (shares) 63,773