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Earnings per Share Earnings per Share (Details) - shares
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 206,854       206,854       206,854 206,854  
Weighted average common shares—basic 45,721,160 45,721,155 45,717,697 45,570,495 45,484,485 45,435,936 45,429,851 45,278,990 45,682,627 45,407,316 45,123,626
Weighted average common shares—diluted 45,721,160 46,029,361 45,922,416 45,908,958 45,484,485 45,760,455 45,726,348 45,654,816 45,990,252 45,407,316 45,123,626
Restricted Shares [Member]                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Incremental common shares attributable to dilutive effect of share-based payment arrangements                 241,974 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 726,936       645,660       726,936 645,660 765,314
Stock Options [Member]                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 206,854       206,854       206,854 206,854 206,123
Incremental common shares attributable to dilutive effect of share-based payment arrangements                 65,651 0 0