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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
 
$
23,141

 
$
19,636

 
$
59,068

 
$
53,421

Loss from discontinued operations
 
—

 
(747
)
 
—

 
(671
)
Net income for calculating basic and diluted earnings per share
 
$
23,141

 
$
18,889

 
$
59,068

 
$
52,750

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
28,904

 
28,616

 
29,128

 
28,951

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options, warrants and nonvested awards
 
449

 
814

 
509

 
778

Weighted-average common shares for calculating diluted earnings per share
 
29,353

 
29,430

 
29,637

 
29,729

 
 
 
 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
 
 
Income from continuing operations
 
$
0.80

 
$
0.69

 
$
2.03

 
$
1.85

Loss from discontinued operations
 
—

 
(0.03
)
 
—

 
(0.03
)
Net income per basic share
 
$
0.80

 
$
0.66

 
$
2.03

 
$
1.82

 
 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
 
Income from continuing operations
 
$
0.79

 
$
0.67

 
$
1.99

 
$
1.80

Loss from discontinued operations
 
—

 
(0.03
)
 
—

 
(0.03
)
Net income per diluted share
 
$
0.79

 
$
0.64

 
$
1.99

 
$
1.77