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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2014
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
 
 
 
March 31,
 
 
 
2014
 
2013
 
Numerator:
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
 
$
22,954

 
$
20,180

 
Income (loss) from discontinued operations
 
(272
)
 
84

 
Net income for calculating basic and diluted earnings per share
 
$
22,682

 
$
20,264

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
28,952

 
29,313

 
Effect of dilutive securities:
 
 
 
 
 
Stock options and nonvested awards
 
390

 
642

 
Weighted-average common shares for calculating diluted earnings per share
 
29,342

 
29,955

 
 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
Income from continuing operations
 
$
0.79

 
$
0.69

 
Income (loss) from discontinued operations
 
(0.01
)
 
—

 
Net income per basic share
 
$
0.78

 
$
0.69

 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
Income from continuing operations
 
$
0.78

 
$
0.68

 
Income (loss) from discontinued operations
 
(0.01
)
 
—

 
Net income per diluted share
 
$
0.77

 
$
0.68