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Stock-Based Compensation - Stock Option Activity (Details) - Stock options
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding - beginning of period (in shares) | shares 1,624,227
Granted (in shares) | shares 0
Exercised (in shares) | shares 21,307
Expired (in shares) | shares (1,530)
Forfeited (in shares) | shares 0
Outstanding - end of period (in shares) | shares 1,601,390
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Outstanding - beginning of period, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares $ 15.30
Granted, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 0.00
Exercised, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 11.07
Expired, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 15.34
Forfeited, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 0.00
Outstanding - end of period, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares $ 15.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options exercisable - end of period (in shares) | shares 866,548
Options exercisable, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares $ 14.02
Outstanding, Weighted-Average Remaining Contractual Life (Years) 6 years 4 months 25 days
Options exercisable, Weighted-Average Remaining Contractual Life (Years) 4 years 1 month 18 days
Outstanding, Aggregate Intrinsic Value | $ $ 6,861,205
Options exercisable, Aggregate Intrinsic Value | $ $ 5,217,790