Quarterly report pursuant to Section 13 or 15(d)

Income Per Share of Common Stock (Details)

v3.19.1
Income Per Share of Common Stock (Details) - shares
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Earnings Per Share [Abstract]      
Treasury stock, shares 3,291,238 3,223,529 2,362,418