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EARNINGS PER COMMON SHARE (Tables)
 6 Months Ended
Jun. 30, 2015
Text Block [Abstract]  
Basic and Diluted Earnings Per Common Share
Basic and Diluted Earnings per Common Share
(Amounts in thousands, except per share data)

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Basic earnings per common share
 
 
 
 
 
Net income
$
46,422

 
$
40,824

 
$
87,906

 
$
75,329

Net income allocated to participating stockholders (1)
(366
)
 
(519
)
 
(838
)
 
(1,147
)
Net income allocated to common stockholders
$
46,056

 
$
40,305

 
$
87,068

 
$
74,182

Weighted-average common shares outstanding
77,942

 
77,062

 
77,676

 
76,869

Basic earnings per common share
$
0.59

 
$
0.52

 
$
1.12

 
$
0.97

Diluted earnings per common share
 
 
 
 
 
 
 
Diluted earnings applicable to common stockholders (2)
$
46,059

 
$
40,308

 
$
87,080

 
$
74,192

Weighted-average diluted common shares outstanding:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
77,942

 
77,062

 
77,676

 
76,869

Dilutive effect of stock awards (3)
1,216

 
744

 
1,161

 
743

Weighted-average diluted common shares outstanding
79,158

 
77,806

 
78,837

 
77,612

Diluted earnings per common share
$
0.58

 
$
0.52

 
$
1.10

 
$
0.96

(1) 
Participating stockholders are those that hold certain share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. Such shares or units are considered participating securities (i.e., certain of the Company’s deferred and restricted stock units and nonvested restricted stock awards).
(2) 
Net income allocated to common stockholders for basic and diluted earnings per share may differ under the two-class method as a result of adding common stock equivalents for options to dilutive shares outstanding, which alters the ratio used to allocate earnings to common stockholders and participating securities for the purposes of calculating diluted earnings per share.
(3) 
For the quarters ended June 30, 2015 and 2014, the weighted-average outstanding non-participating securities of 238,000 and 1.3 million shares, respectively, and for the six months ended June 30, 2015 and 2014, the weighted-average outstanding non-participating securities of 483,000 and 1.3 million shares, respectively, were not included in the computation of diluted earnings per common share because their inclusion would have been antidilutive for the periods presented.