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Earnings per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Basic average common shares outstanding1
16,457,196

 
17,065,663

 
16,470,525

 
17,293,091

Incremental shares due to:
 
 
 
 
 
 
 
Restricted stock units
37,703

 
53,108

 
35,922

 
32,355

Performance shares
78,351

 
89,783

 
74,975

 
60,617

Stock options
16,868

 
25,441

 
30,636

 
—

Diluted average common shares outstanding
16,590,118

 
17,233,995

 
16,612,058

 
17,386,063

 
 
 
 
 
 
 
 
Basic net earnings per common share
$
0.49

 
$
1.22

 
$
0.94

 
$
2.27

Diluted net earnings per common share
0.48

 
1.21

 
0.94

 
2.26

 
 
 
 
 
 
 
 
Anti-dilutive shares excluded from calculation
515,322

 
222,026

 
493,150

 
665,605

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