Annual report pursuant to Section 13 and 15(d)

Income Per Share - Anti-dilutive common stock equivalents (Details)

v3.10.0.1
Income Per Share - Anti-dilutive common stock equivalents (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 85,205 45,766 473,792
Restricted Stock Awards | Service-based conditions      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 5,192 458 35,182
Restricted Stock Awards | Market-based conditions      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 7,498   6,323
Stock Options      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 72,515 45,308 432,287