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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $)
In Thousands
Total
ACCUMULATED OTHER COMPREHENSIVE (LOSS)
PARTIALLY OWNED PROPERTIES
OPERATING PARTNERSHIP
OPERATING PARTNERSHIP
PREFERENCE UNITS
OPERATING PARTNERSHIP
ACCUMULATED OTHER COMPREHENSIVE (LOSS)
OPERATING PARTNERSHIP
PARTIALLY OWNED PROPERTIES
OPERATING PARTNERSHIP
GENERAL PARTNER
OPERATING PARTNERSHIP
LIMITED PARTNERS
Balance, beginning of year at Dec. 31, 2010    $ 200,000$ (57,818)$ 7,991$ 4,948,004$ 110,399
OP Unit Issuance:         
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       8,095(8,095)
Issuance of OP Units       154,508 
Exercise of EQR share options       94,373 
EQR's Employee Share Purchase Plan (ESPP)       4,558 
Conversion of EQR restricted shares to LTIP Units   3,934   (3,934)3,934
Share-based employee compensation expense:         
EQR restricted shares       7,277 
EQR share options       7,389 
EQR ESPP discount       1,070 
Offering costs       (2,770) 
Net income available to Units - General Partner   780,704   780,704 
OP Units - General Partner distributions       (299,383) 
Supplemental Executive Retirement Plan (SERP)       10,198 
Acquisition of Noncontrolling Interests - Partially Owned Properties  (8,025)   (8,025)(4,784) 
Change in market value of Redeemable Limited Partners       16,023 
Equity compensation associated with Units - Limited Partners   2,734    2,734
Net income available to Units - Limited Partners   36,275    36,275
Units - Limited Partners distributions        (13,777)
Change in carrying value of Redeemable Limited Partners        (11,281)
Adjustment for Limited Partners ownership in Operating Partnership       (597)597
Accumulated other comprehensive (loss) - derivative instruments:         
Unrealized holding (losses) arising during the period(130,367)(130,367) (130,367) (130,367)   
Accumulated other comprehensive income2,8422,842 2,842 2,842   
Accumulated other comprehensive income - other instruments:         
Unrealized holding gains (losses) arising during the period     311   
Net income attributable to Noncontrolling Interests      418  
Contributions by Noncontrolling Interests  64   64  
Distributions to Noncontrolling Interests  (922)(13,777)  (922)  
Other      (1,240)  
Balance, end of period at Sep. 30, 2011    200,000(185,032)(1,714)5,720,731120,786
Balance, beginning of year at Jun. 30, 2011         
Share-based employee compensation expense:         
Net income available to Units - General Partner   104,382     
Net income available to Units - Limited Partners   4,742     
Accumulated other comprehensive (loss) - derivative instruments:         
Unrealized holding (losses) arising during the period(105,248)  (105,248)     
Accumulated other comprehensive income951  951     
Balance, end of period at Sep. 30, 2011    $ 200,000