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Earnings Per Share - Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 1,059,225 946,962 658,337
Share-based compensation plans      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 1,059,225 894,720 606,095
Warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 0 52,242 52,242