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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Basic and diluted earnings per common share were calculated as follows (in thousands, except per share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net earnings
$
23,147

 
$
17,681

 
$
50,445

 
$
44,947

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,039

 
52,824

 
53,036

 
52,809

Effect of dilutive stock awards
322

 
250

 
333

 
238

Weighted-average dilutive shares
53,361

 
53,074

 
53,369

 
53,047

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.44

 
$
0.33

 
$
0.95

 
$
0.85

Diluted earnings per share
$
0.43

 
$
0.33

 
$
0.95

 
$
0.85