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The calculation of net income per common share for the three and nine months ended September 30, 2019 and 2018 was as follows: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Common Share
Net income	$ 36,495	$ 38,948	$ 107,487	$ 111,959
Average common shares outstanding	34,233	34,309	34,418	34,292
Basic net income per common share	$ 1.07	$ 1.14	$ 3.12	$ 3.26
Adjustment for common share equivalents	23	152	33	152
Average common shares outstanding-diluted	34,256	34,461	34,451	34,444
Diluted net income per common share	$ 1.07	$ 1.13	$ 3.12	$ 3.25
Anti-dilutive shares	2	3	20

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