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Earnings per Common Share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share
The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Basic average common shares outstanding1
16,844,920

 
18,860,017

 
17,141,329

 
19,088,348

Incremental shares due to:
 
 
 
 
 
 
 
Restricted stock units
54,796

 
89,727

 
35,853

 
78,147

Performance shares
104,476

 
140,851

 
74,604

 
117,543

Stock options
55,466

 

 
1,148

 
54

Diluted average common shares outstanding
17,059,658

 
19,090,595

 
17,252,934

 
19,284,092

 
 
 
 
 
 
 
 
Basic net earnings per common share
$
0.05

 
$
1.22

 
$
2.35

 
$
2.33

Diluted net earnings per common share
0.05

 
1.21

 
2.33

 
2.30

 
 
 
 
 
 
 
 
Anti-dilutive shares excluded from calculation
5,783

 
282,769

 
502,293

 
309,018

1 
Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance.