Annual report pursuant to Section 13 and 15(d)

Earnings per Share - Anti-dilutive Shares (Details)

v3.10.0.1
Earnings per Share - Anti-dilutive Shares (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance based restricted stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive shares 1,643,760 1,769,447 1,731,522
Performance based stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive shares 586,253 586,523 417,086
Restricted stock awards and restricted units      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive shares 10,296 0 751,410
Stock option      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive shares 863,063 621,747 1,381,352