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Earnings Per Common Share (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Weighted average number of common shares outstanding - basic (in shares) 74,002 73,355 72,754
Effect of dilutive securities (in shares) 610 993 720
Weighted average number of common shares outstanding - diluted (in shares) 74,612 74,348 73,474
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share (in shares) 600 100 500
Weighted average exercise price of options (in dollars per share) $ 42.84 $ 39.38 $ 34.14