Annual report pursuant to Section 13 and 15(d)

Income Per Share of Common Stock - Narrative (Details)

v3.19.1
Income Per Share of Common Stock - Narrative (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]    
Shares of treasury stock excluded from weighted average number of common stock shares outstanding 3,223,529 2,362,418