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Earnings Per Share - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 35,564,946 35,132,857 35,488,271 35,087,982
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share 448,595 64,483 389,567  
Dividends $ 0 $ 0 $ 0 $ 0