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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share (unaudited, in thousands, except per share data):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
 
$
15,663

 
$
16,333

 
$
35,927

 
$
33,785

Income from discontinued operations
 
—

 
16

 
—

 
76

Net income for calculating basic and diluted earnings per share
 
$
15,663

 
$
16,349

 
$
35,927

 
$
33,861

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
29,167

 
28,658

 
29,240

 
29,119

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options, warrants and nonvested awards
 
436

 
746

 
539

 
759

Weighted-average common shares for calculating diluted earnings per share
 
29,603

 
29,404

 
29,779

 
29,878

 
 
 
 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
 
 
Income from continuing operations
 
$
0.54

 
$
0.57

 
$
1.23

 
$
1.16

Income from discontinued operations
 
—

 
—

 
—

 
—

Net income per basic share
 
$
0.54

 
$
0.57

 
$
1.23

 
$
1.16

 
 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
 
Income from continuing operations
 
$
0.53

 
$
0.56

 
$
1.21

 
$
1.13

Income from discontinued operations
 
—

 
—

 
—

 
—

Net income per diluted share
 
$
0.53

 
$
0.56

 
$
1.21

 
$
1.13