Quarterly report pursuant to Section 13 or 15(d)

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

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Income Per Share - Anti-dilutive common stock equivalents (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 5,010 430,329 59,908 499,024
Restricted Stock Awards | Service-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents   11,812 610 41,261
Restricted Stock Awards | Market-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents       8,431
Stock Options        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 5,010 418,517 59,298 449,332