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Income per Common Unit of the Operating Partnership
 12 Months Ended
Dec. 31, 2011
Income Per Common Unit [Line Items]  
Earnings Per Share [Text Block]

The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):
 
2011
 
2010
 
Income
(Numerator)
 
Weighted
Average
Shares
(Denominator)
 
Per Share
 
Income
(Numerator)
 
Weighted
Average
Shares
(Denominator)
 
Per Share
Basic income from continuing operations
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations net of noncontrolling interest
$
115,469

 
114,755

 
$
1.00

 
$
105,172

 
112,924

 
$
0.93

Dilutive shares for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income from continuing operations
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations net of noncontrolling interest
115,469

 
115,503

 
$
1.00

 
105,172

 
113,606

 
$
0.92

Basic income from discontinued operations
 
 
 
 
 
 
 
 
 
 
 
Discontinued operations net of noncontrolling interest
68,530

 
114,755

 
$
0.60

 
22,590

 
112,924

 
$
0.20

Dilutive shares for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income from discontinued operations
 
 
 
 
 
 
 
 
 
 
 
Discontinued operations net of noncontrolling interest
68,530

 
115,503

 
$
0.59

 
22,590

 
113,606

 
$
0.20

Basic income per common share
 
 
 
 
 
 
 
 
 
 
 
Net income available to common shareholders
183,999

 
114,755

 
$
1.60

 
127,762

 
112,924

 
$
1.13

Dilutive shares for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income per common share
 
 
 
 
 
 
 
 
 
 
 
Net income available to common shareholders
$
183,999

 
115,503

 
$
1.59

 
$
127,762

 
113,606

 
$
1.12


 
2009
 
Income
(Numerator)
 
Weighted
Average
Shares
(Denominator)
 
Per Share
Basic income from continuing operations
 
 
 
 
 
Income from continuing operations net of noncontrolling interest
$
9,623

 
107,550

 
$
0.09

Dilutive shares for long-term compensation plans
—

 
452

 
 
Diluted income from continuing operations
 
 
 
 
 
Income from continuing operations net of noncontrolling interest
9,623

 
108,002

 
$
0.09

Basic income from discontinued operations
 
 
 
 
 
Discontinued operations net of noncontrolling interest
46,753

 
107,550

 
$
0.43

Dilutive shares for long-term compensation plans
—

 
452

 
 
Diluted income from discontinued operations
 
 
 
 
 
Discontinued operations net of noncontrolling interest
46,753

 
108,002

 
$
0.43

Basic income per common share
 
 
 
 
 
Net income available to common shareholders
56,376

 
107,550

 
$
0.52

Dilutive shares for long-term compensation plans
—

 
452

 
 
Diluted income per common share
 
 
 
 
 
Net income available to common shareholders
$
56,376

 
108,002

 
$
0.52



Dilutive shares for long-term compensation plans represent the unvested common shares outstanding during the year as well as the dilutive effect of outstanding options. The amounts of anti-dilutive options that were excluded from the computation of diluted income per common share as the exercise price was higher than the average share price of the Company in 2011, 2010 and 2009 were 1,685,000, 1,433,000 and 2,661,000, respectively.
During the years ended December 31, 2011, 2010 and 2009, 256,000, 315,000 and 187,000 common shares, respectively, were issued upon the exercise of options.
During the years ended December 31, 2011, 2010 and 2009, individuals acquired 119,987, 82,621 and 63,613 common shares, respectively, in exchange for the same number of common units. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.
Liberty Property Limited Partnership [Member]
  
Income Per Common Unit [Line Items]  
Earnings Per Share [Text Block]

The following table sets forth the computation of basic and diluted income per common unit of the Operating Partnership (in thousands, except per unit amounts):
 
 
2011
 
2010
 
Income
(Numerator)
 
Weighted
Average Units
(Denominator)
 
Per Unit
 
Income
(Numerator)
 
Weighted
Average Units
(Denominator)
 
Per Unit
Income from continuing operations net of noncontrolling interest
$
140,382

 
 
 
 
 
$
129,837

 
 
 
 
Less: Preferred unit distributions
(21,069
)
 
 
 
 
 
(21,012
)
 
 
 
 
Basic income from continuing operations
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations available to common unitholders
119,313

 
118,624

 
$
1.00

 
108,825

 
116,871

 
$
0.93

Dilutive units for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income from continuing operations
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations available to common unitholders
119,313

 
119,372

 
$
1.00

 
108,825

 
117,553

 
$
0.92

Basic income from discontinued operations
 
 
 
 
 
 
 
 
 
 
 
Discontinued operations
70,839

 
118,624

 
$
0.60

 
23,373

 
116,871

 
$
0.20

Dilutive units for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income from discontinued operations
 
 
 
 
 
 
 
 
 
 
 
Discontinued operations
70,839

 
119,372

 
$
0.59

 
23,373

 
117,553

 
$
0.20

Basic income per common unit
 
 
 
 
 
 
 
 
 
 
 
Income available to common unitholders
190,152

 
118,624

 
$
1.60

 
132,198

 
116,871

 
$
1.13

Dilutive units for long-term compensation plans
—

 
748

 
 
 
—

 
682

 
 
Diluted income per common unit
 
 
 
 
 
 
 
 
 
 
 
Income available to common unitholders
$
190,152

 
119,372

 
$
1.59

 
$
132,198

 
117,553

 
$
1.12



 
2009
 
Income
(Numerator)
 
Weighted
Average Units
(Denominator)
 
Per Unit
Income from continuing operations net of noncontrolling interest
$
31,035

 
 
 
 
Less: Preferred unit distributions
(21,012
)
 
 
 
 
Basic income from continuing operations
 
 
 
 
 
Income from continuing operations available to common unitholders
10,023

 
111,568

 
$
0.09

Dilutive units for long-term compensation plans
—

 
452

 
 
Diluted income from continuing operations
 
 
 
 
 
Income from continuing operations available to common unitholders
10,023

 
112,020

 
$
0.09

Basic income from discontinued operations
 
 
 
 
 
Discontinued operations
48,466

 
111,568

 
$
0.43

Dilutive units for long-term compensation plans
—

 
452

 
 
Diluted income from discontinued operations
 
 
 
 
 
Discontinued operations
48,466

 
112,020

 
$
0.43

Basic income per common unit
 
 
 
 
 
Income available to common unitholders
58,489

 
111,568

 
$
0.52

Dilutive units for long-term compensation plans
—

 
452

 
 
Diluted income per common unit
 
 
 
 
 
Income available to common unitholders
$
58,489

 
112,020

 
$
0.52



Dilutive units for long-term compensation plans represent the unvested common units outstanding during the year as well as the dilutive effect of outstanding options. The amounts of anti-dilutive options that were excluded from the computation of diluted income per common unit as the exercise price was higher than the average unit price of the Company in 2011, 2010 and 2009 were 1,685,000, 1,433,000 and 2,661,000, respectively.
During the year ended December 31, 2011, 2010 and 2009, 256,000, 315,000 and 187,000 common units, respectively, were issued upon the exercise of options.
During the year ended December 31, 2011, 2010 and 2009, individuals acquired 119,987, 82,621 and 63,613 common shares of the Trust in exchange for the same number of common units of the Operating Partnership. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.