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Stock-Based Compensation - Stock Option Activity (Details) - Stock options
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding - beginning of period (in shares) | shares 457,851
Granted (in shares) | shares 30,660
Expired (in shares) | shares (24,585)
Outstanding - end of period (in shares) | shares 463,926
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 $ 19.29
Granted, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 16.12
Expired, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares 19.12
Outstanding - end of period, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares $ 19.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options exercisable - end of period (in shares) | shares 335,266
Options exercisable, Weighted-Average Exercise Price Per Share (in dollars per share) | $ / shares $ 20.32
Outstanding, Weighted-Average Remaining Contractual Life (Years) 2 years 7 months 28 days
Options exercisable, Weighted-Average Remaining Contractual Life (Years) 2 years 7 months 28 days
Outstanding, Aggregate Intrinsic Value | $ $ 0
Options exercisable, Aggregate Intrinsic Value | $ $ 0