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Stock-Based Compensation - Schedule of Stock Options Roll Forward (Details) - Stock options
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding as of beginning of period | shares 450,890
Exercised | shares (141,600)
Forfeited or expired | shares (14,393)
Outstanding as of end of period | shares 294,897
Exercisable as of end of period | shares 208,515
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price, options outstanding, as of beginning of period $ 15.29
Weighted average exercise price, exercised 14.67
Weighted average exercise price, forfeited 12.73
Weighted average exercise price, options outstanding, as of end of period 15.72
Weighted average exercise price, options exercisable $ 12.77