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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net earnings
$
9,946

 
$
23,147

 
$
35,007

 
$
50,445

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,092

 
53,039

 
53,089

 
53,036

Effect of dilutive stock awards
289

 
322

 
273

 
333

Weighted-average dilutive shares
53,381

 
53,361

 
53,362

 
53,369

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.19

 
$
0.44

 
$
0.66

 
$
0.95

Diluted earnings per share
$
0.19

 
$
0.43

 
$
0.66

 
$
0.95