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EARNINGS PER COMMON SHARE (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per common share
The following table shows the amounts used in computing our basic and diluted earnings per common share:
 
For the Three Months Ended March 31,
 
2013
 
2012
 
(In thousands, except per share amounts)
Numerator for basic and diluted earnings per share:
 
 
 
Income from continuing operations attributable to common stockholders
$
117,820

 
$
47,262

Discontinued operations
(5,627
)
 
43,364

Net income attributable to common stockholders          
$
112,193

 
$
90,626

Denominator:
 
 
 
Denominator for basic earnings per share—weighted average shares
291,455

 
288,375

Effect of dilutive securities:
 
 
 
Stock options
573

 
512

Restricted stock awards
120

 
64

OP units
1,776

 
1,862

Denominator for diluted earnings per share—adjusted weighted average shares
293,924

 
290,813

Basic earnings per share:
 
 
 
Income from continuing operations attributable to common stockholders
$
0.40

 
$
0.16

Discontinued operations
(0.02
)
 
0.15

Net income attributable to common stockholders          
$
0.38

 
$
0.31

Diluted earnings per share:
 
 
 
Income from continuing operations attributable to common stockholders
$
0.40

 
$
0.16

Discontinued operations
(0.02
)
 
0.15

Net income attributable to common stockholders          
$
0.38

 
$
0.31