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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands
Total
PREFERRED SHARES
COMMON SHARES, $0.01 PAR VALUE
PAID IN CAPITAL
RETAINED EARNINGS
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
OPERATING PARTNERSHIP
PREFERENCE INTERESTS AND UNITS
PARTIALLY OWNED PROPERTIES
7.00% Series E Cumulative Convertible Preferred [Member]
Beginning Balance at Dec. 31, 2007 $ 209,662$ 2,696$ 4,134,209$ 586,685$ (15,882)$ 162,185$ 184$ 26,236 
Conversion of 7.00% Series E Cumulative Convertible (828)        
Conversion of 7.00% Series H Cumulative Convertible (48)        
Common Share Issuance:          
Conversion of Preferred Shares into Common Shares   876      
Conversion of OP Units into Common Shares  1749,884  (49,901)   
Exercise of share options  1024,624      
Employee Share Purchase Plan (ESPP)  26,168      
Share-based employee compensation expense:          
Restricted/performance shares  5       
Performance shares   (8)      
Restricted shares   17,273      
Share options   5,846      
ESPP discount   1,289      
Common Shares repurchased and retired  (2)(7,906)      
Offering costs   (102)      
Supplemental Executive Retirement Plan (SERP)   (7,304)      
Acquisition Noncontrolling Interests - Partially Owned Properties        (1,877) 
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership(65,524)  65,524      
Adjustment for Noncontrolling Interests ownership in Operating Partnership   (16,884)  16,884   
Net income attributable to controlling interests407,622         
Common Share distributions    (523,648)     
Preferred Share distributions    (14,507)     
Accumulated other comprehensive (loss) income - derivative instruments:          
Unrealized holding (losses) gains arising during the year(23,815)    (23,815)    
Accumulated other comprehensive loss2,696    2,696    
Accumulated other comprehensive income (loss) - other instruments:          
Unrealized holding gains arising during the year     1,202    
Issuance of OP Units to Noncontrolling Interests      849   
Net (loss) income attributable to Noncontrolling Interests436,413   407,622 26,126 2,650 
Distributions to Noncontrolling Interests      (33,745) (3,072) 
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership(15,247)     15,247   
Contributions by Noncontrolling Interests        2,083 
Other        (500) 
Ending Balance at Dec. 31, 2008 208,7862,7284,273,489456,152(35,799)137,64518425,520 
Conversion of 7.00% Series E Cumulative Convertible (13)        
Common Share Issuance:          
Conversion of Preferred Shares into Common Shares   13      
Conversion of OP Units into Common Shares  2748,776  (48,803)   
Issuance of Common Shares  35123,699      
Exercise of share options  49,132      
Employee Share Purchase Plan (ESPP)  35,289      
Share-based employee compensation expense:          
Restricted/performance shares  3       
Performance shares   179      
Restricted shares   11,129      
Share options   5,996      
ESPP discount   1,303      
Common Shares repurchased and retired   (1,124)      
Offering costs   (2,536)      
Supplemental Executive Retirement Plan (SERP)   27,809      
Acquisition Noncontrolling Interests - Partially Owned Properties   (1,496)    (11,705) 
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership14,544  (14,544)      
Adjustment for Noncontrolling Interests ownership in Operating Partnership   (9,688)  9,688   
Net income attributable to controlling interests362,273         
Common Share distributions    (450,287)     
Preferred Share distributions    (14,479)     
Accumulated other comprehensive (loss) income - derivative instruments:          
Unrealized holding (losses) gains arising during the year37,676    37,676    
Accumulated other comprehensive loss3,724    3,724    
Other(449)    449    
Accumulated other comprehensive income (loss) - other instruments:          
Unrealized holding gains arising during the year     3,574    
(Gains) realized during the year(4,943)    (4,943)    
Issuance of OP Units to Noncontrolling Interests      1,034   
Issuance of LTIP Units to Noncontrolling Interests      78   
Equity compensation associated with Noncontrolling Interests      1,194   
Conversion of Series B Junior Preference Units       -184  
Net (loss) income attributable to Noncontrolling Interests382,029   362,273 20,305 (558) 
Distributions to Noncontrolling Interests      (25,679) (2,439) 
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership(20,658)     20,658   
Contributions by Noncontrolling Interests        893 
Other        (657) 
Ending Balance at Dec. 31, 20095,174,513208,7732,8004,477,426353,6594,681116,120011,054 
Redemption of Cumulative Preference shares         (834)
Conversion of 7.00% Series E Cumulative Convertible (7,378)        
Conversion of 7.00% Series H Cumulative Convertible (561)        
Common Share Issuance:          
Conversion of Preferred Shares into Common Shares  37,936      
Conversion of OP Units into Common Shares  919,713  (19,722)   
Issuance of Common Shares  61291,841      
Exercise of share options  2571,571      
Employee Share Purchase Plan (ESPP)  25,110      
Share-based employee compensation expense:          
Restricted/performance shares  2       
Restricted shares   9,779      
Share options   7,421      
ESPP discount   1,290      
Common Shares repurchased and retired   (1,887)      
Offering costs   (4,657)      
Supplemental Executive Retirement Plan (SERP)   8,559      
Acquisition Noncontrolling Interests - Partially Owned Properties   (16,888)    175 
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership129,918  (129,918)      
Adjustment for Noncontrolling Interests ownership in Operating Partnership   (5,775)  5,775   
Net income attributable to controlling interests283,610   283,610     
Common Share distributions    (419,320)     
Preferred Share distributions    (14,368)     
Accumulated other comprehensive (loss) income - derivative instruments:          
Unrealized holding (losses) gains arising during the year(65,894)    (65,894)    
Accumulated other comprehensive loss3,338    3,338    
Accumulated other comprehensive income (loss) - other instruments:          
Unrealized holding gains arising during the year     57    
Issuance of OP Units to Noncontrolling Interests      8,245   
Equity compensation associated with Noncontrolling Interests      2,524   
Net (loss) income attributable to Noncontrolling Interests295,983     13,099 (726) 
Distributions to Noncontrolling Interests      (20,300) (2,952) 
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership(4,658)     4,658   
Contributions by Noncontrolling Interests        222 
Other        218 
Ending Balance at Dec. 31, 2010$ 5,208,576$ 200,000$ 2,902$ 4,741,521$ 203,581$ (57,818)$ 110,399$ 0$ 7,991