Annual report pursuant to Section 13 and 15(d)

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

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Net Income Per Share - Anti-dilutive common stock equivalents (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 63,308 85,205 45,766
Restricted Stock Awards | Service-based conditions      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 3,948 5,192 458
Restricted Stock Awards | Market-based conditions      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 4,925 7,498  
Stock Options      
Anti-dilutive common stock equivalents      
Total anti-dilutive common stock equivalents 54,435 72,515 45,308