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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (USD $)
In Thousands, unless otherwise specified
Total
USD ($)
Preferred Stock [Member]
USD ($)
General Partner [Member]
USD ($)
Limited Partner [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Partially Owned Properties [Member]
USD ($)
Series N Preferred Stock [Member]
USD ($)
Series N Preferred Stock [Member]
Preferred Stock [Member]
Balance, beginning of year at Dec. 31, 2010   $ 200,000 $ 4,948,004 $ 110,399 $ (57,818) $ 7,991    
Payments for Repurchase of Preferred Stock and Preference Stock 0 0            
Preferred Stock Preference Units Dividend Rate Percentage             6.48% 6.48%
OP Unit Issuance:                
Conversion of OP Units held by Limited Partners into OP Units held by General Partner     8,580 (8,580)        
Issuance of OP Units     201,942          
Exercise of EQR share options     95,322          
EQR's Employee Share Purchase Plan (ESPP)     5,262          
Conversion of EQR restricted shares to LTIP Units     (3,934) 3,934        
Share-based employee compensation expense:                
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition     9,102          
EQR share options     9,545          
EQR ESPP discount     1,194          
Offering costs     (3,596)          
Premium on Redemption of Preferred Shares Preference Units Original Issuance     0          
Net income available to Units - General Partner     879,720          
OP Units - General Partner distributions     (467,729)          
Supplemental Executive Retirement Plan (SERP)     10,765          
Acquisition of Noncontrolling Interests - Partially Owned Properties     (4,784)     (8,025)    
Change in market value of Redeemable Limited Partners     (22,714)          
Adjustment for Limited Partners ownership in Operating Partnership     (946) 946        
Issuance of OP Units to Noncontrolling Interests       0        
Issuance Of Long Term Incentive Plan Units Into Noncontrolling Interest       0        
Equity compensation associated with Units - Limited Partners       3,641        
Limited Partners       40,780        
Units - Limited Partners distributions       (21,434)        
Change in carrying value of Redeemable Limited Partners       (10,150)        
Accumulated other comprehensive (loss) income - derivative instruments:                
Unrealized holding gains (losses) arising during the year (143,598)       (143,598)      
Losses reclassified into earnings from other comprehensive income (4,343)       4,343      
Accumulated other comprehensive income (loss) - other instruments:                
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 355       355      
Gain on Sale of Securities, Net 0       0      
Currency translation adjustments arising during the year 0       0      
Net income 935,197         832    
Contributions - Noncontrolling Interests - Partially Owned Properties 75,911         75,911    
Archstone Acquisition Noncontrolling Interests Partially Owned Properties           0    
Distributions to Noncontrolling Interests           (1,163)    
Stockholders' Equity, Other           (1,240)    
Balance, end of period at Dec. 31, 2011   200,000 5,665,733 119,536 (196,718) 74,306    
Payments for Repurchase of Preferred Stock and Preference Stock 150,000 (150,000)            
Preferred Stock Preference Units Dividend Rate Percentage             6.48% 0.00%
OP Unit Issuance:                
Conversion of OP Units held by Limited Partners into OP Units held by General Partner     18,929 (18,929)        
Issuance of OP Units     1,388,583          
Exercise of EQR share options     49,039          
EQR's Employee Share Purchase Plan (ESPP)     5,399          
Conversion of EQR restricted shares to LTIP Units     0 0        
Share-based employee compensation expense:                
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition     8,936          
EQR share options     11,752          
EQR ESPP discount     965          
Offering costs     (39,359)          
Premium on Redemption of Preferred Shares Preference Units Original Issuance     5,129          
Net income available to Units - General Partner     826,212          
OP Units - General Partner distributions     (554,429)          
Supplemental Executive Retirement Plan (SERP)     282          
Acquisition of Noncontrolling Interests - Partially Owned Properties     1,293     (1,306)    
Change in market value of Redeemable Limited Partners     38,734          
Adjustment for Limited Partners ownership in Operating Partnership     5,763 (5,763)        
Issuance of OP Units to Noncontrolling Interests       66,606        
Issuance Of Long Term Incentive Plan Units Into Noncontrolling Interest       5        
Equity compensation associated with Units - Limited Partners       5,307        
Limited Partners       38,641        
Units - Limited Partners distributions       (25,095)        
Change in carrying value of Redeemable Limited Partners       (20,702)        
Accumulated other comprehensive (loss) income - derivative instruments:                
Unrealized holding gains (losses) arising during the year (11,772)       (11,772)      
Losses reclassified into earnings from other comprehensive income (14,678)       14,678      
Accumulated other comprehensive income (loss) - other instruments:                
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 664       664      
Gain on Sale of Securities, Net 0       0      
Currency translation adjustments arising during the year 0       0      
Net income 881,204         844    
Contributions - Noncontrolling Interests - Partially Owned Properties 8,221         8,221    
Archstone Acquisition Noncontrolling Interests Partially Owned Properties           0    
Distributions to Noncontrolling Interests           (5,131)    
Stockholders' Equity, Other           754    
Balance, end of period at Dec. 31, 2012   50,000 7,432,961 159,606 (193,148) 77,688    
Payments for Repurchase of Preferred Stock and Preference Stock 0 0         150,000  
Preferred Stock Preference Units Dividend Rate Percentage             6.48% 6.48%
OP Unit Issuance:                
Conversion of OP Units held by Limited Partners into OP Units held by General Partner     1,699 (1,699)        
Issuance of OP Units     1,929,868          
Exercise of EQR share options     17,252          
EQR's Employee Share Purchase Plan (ESPP)     3,401          
Conversion of EQR restricted shares to LTIP Units     0 0        
Share-based employee compensation expense:                
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition     13,264          
EQR share options     10,514          
EQR ESPP discount     632          
Offering costs     (1,047)          
Premium on Redemption of Preferred Shares Preference Units Original Issuance     0       5,100  
Net income available to Units - General Partner     1,826,468          
OP Units - General Partner distributions     (666,565)          
Supplemental Executive Retirement Plan (SERP)     (422)          
Acquisition of Noncontrolling Interests - Partially Owned Properties     0     0    
Change in market value of Redeemable Limited Partners     79,667          
Adjustment for Limited Partners ownership in Operating Partnership     (35,329) 35,329        
Issuance of OP Units to Noncontrolling Interests       0        
Issuance Of Long Term Incentive Plan Units Into Noncontrolling Interest       5        
Equity compensation associated with Units - Limited Partners       13,609        
Limited Partners       75,278        
Units - Limited Partners distributions       (26,277)        
Change in carrying value of Redeemable Limited Partners       (44,439)        
Accumulated other comprehensive (loss) income - derivative instruments:                
Unrealized holding gains (losses) arising during the year 18,771       18,771      
Losses reclassified into earnings from other comprehensive income (20,141)       20,141      
Accumulated other comprehensive income (loss) - other instruments:                
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 583       583      
Gain on Sale of Securities, Net (2,122)       (2,122)      
Currency translation adjustments arising during the year 613       613      
Net income 1,905,353         (538)    
Contributions - Noncontrolling Interests - Partially Owned Properties 27,660         27,660    
Archstone Acquisition Noncontrolling Interests Partially Owned Properties           28,263    
Distributions to Noncontrolling Interests           (6,490)    
Stockholders' Equity, Other           0    
Balance, end of period at Dec. 31, 2013   $ 50,000 $ 10,612,363 $ 211,412 $ (155,162) $ 126,583