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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP - USD ($)
$ in Thousands
Total
ERPOP [Member]
PREFERRED SHARES
ERPOP [Member]
General Partner [Member]
General Partner [Member]
ERPOP [Member]
Limited Partner
ERPOP [Member]
AOCI Attributable to Parent
ERPOP [Member]
DISTRIBUTIONS [Member]
PARTIALLY OWNED PROPERTIES [Member]
ERPOP [Member]
Balance, beginning of year at Dec. 31, 2016     $ 37,280   $ 10,305,707 $ 221,297 $ (113,909)    
Balance, beginning of year at Dec. 31, 2016                 $ 10,609
OP Unit Issuance:                  
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         15,900 (15,900)      
Exercise of EQR share options         31,596        
EQR's Employee Share Purchase Plan (ESPP)       $ 3,744          
Share-based employee compensation expense:                  
EQR restricted shares         9,777        
EQR share options         6,835        
EQR ESPP discount         747        
Net income available to Units - General Partner   $ 600,363     600,363        
OP Units - General Partner distributions         (740,459)        
Offering costs         (51)        
Supplemental Executive Retirement Plan (SERP)         (594)        
Change in market value of Redeemable Limited Partners         41,916        
Adjustment for Limited Partners ownership in Operating Partnership         18,315 (18,315)      
LIMITED PARTNERS                  
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         15,900 (15,900)      
Equity compensation associated with Units - Limited Partners           10,523      
Net income available to Units - Limited Partners   22,604       22,604      
Units - Limited Partners distributions           (26,739)      
Change in carrying value of Redeemable Limited Partners           33,221      
Adjustment for Limited Partners ownership in Operating Partnership         18,315 (18,315)      
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)                  
Unrealized holding gains (losses) arising during the year $ 6,439 6,439         6,439    
Losses reclassified into earnings from other comprehensive income (18,858) (18,858)         18,858    
DISTRIBUTIONS                  
Distributions declared per Unit outstanding               $ 2.015  
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES                  
Net income attributable to Noncontrolling Interests 628,381 628,381             2,323
Contributions by Noncontrolling Interests                 125
Distributions to Noncontrolling Interests                 (8,349)
Balance, end of year at Dec. 31, 2017     37,280   10,293,796 226,691 (88,612)    
Balance, end of year at Dec. 31, 2017                 4,708
OP Unit Issuance:                  
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         4,098 (4,098)      
Exercise of EQR share options         30,655        
EQR's Employee Share Purchase Plan (ESPP)       3,879          
Share-based employee compensation expense:                  
EQR restricted shares         8,258        
EQR share options         9,734        
EQR ESPP discount         767        
Net income available to Units - General Partner   654,445     654,445        
OP Units - General Partner distributions         (796,212)        
Offering costs         (27)        
Supplemental Executive Retirement Plan (SERP)         (454)        
Change in market value of Redeemable Limited Partners         (13,922)        
Adjustment for Limited Partners ownership in Operating Partnership         5,893 (5,893)      
LIMITED PARTNERS                  
Issuance of restricted units to Limited Partners           1      
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         4,098 (4,098)      
Equity compensation associated with Units - Limited Partners           14,009      
Net income available to Units - Limited Partners   24,939       24,939      
Units - Limited Partners distributions           (28,682)      
Change in carrying value of Redeemable Limited Partners           1,771      
Adjustment for Limited Partners ownership in Operating Partnership         5,893 (5,893)      
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)                  
Unrealized holding gains (losses) arising during the year 5,174 5,174         5,174    
Losses reclassified into earnings from other comprehensive income (18,452) (18,452)         18,452    
DISTRIBUTIONS                  
Distributions declared per Unit outstanding               2.16  
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES                  
Net income attributable to Noncontrolling Interests 685,192 685,192             2,718
Acquisition Noncontrolling Interests Partially Owned Properties                 (13)
Contributions by Noncontrolling Interests                 125
Distributions to Noncontrolling Interests                 (9,831)
Balance, end of year at Dec. 31, 2018     37,280   10,200,910 228,738 (64,986)    
Balance, end of year at Dec. 31, 2018                 (2,293)
OP Unit Issuance:                  
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         10,410 (10,410)      
Exercise of EQR share options         77,785        
EQR's Employee Share Purchase Plan (ESPP)       $ 3,116          
Share-based employee compensation expense:                  
EQR restricted shares         12,438        
EQR share options         2,675        
EQR ESPP discount         642        
Net income available to Units - General Partner   967,287     967,287        
OP Units - General Partner distributions         (842,555)        
Offering costs         (991)        
Supplemental Executive Retirement Plan (SERP)         (1,675)        
Change in market value of Redeemable Limited Partners         (82,283)        
Adjustment for Limited Partners ownership in Operating Partnership         8,030 (8,030)      
LIMITED PARTNERS                  
Issuance of restricted units to Limited Partners           2      
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         10,410 (10,410)      
Equity compensation associated with Units - Limited Partners           13,410      
Net income available to Units - Limited Partners   36,034       36,034      
Units - Limited Partners distributions           (29,896)      
Change in carrying value of Redeemable Limited Partners           (2,011)      
Adjustment for Limited Partners ownership in Operating Partnership         8,030 (8,030)      
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)                  
Unrealized holding gains (losses) arising during the year (33,765) (33,765)         (33,765)    
Losses reclassified into earnings from other comprehensive income (21,188) (21,188)         21,188    
DISTRIBUTIONS                  
Distributions declared per Unit outstanding               $ 2.27  
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES                  
Net income attributable to Noncontrolling Interests $ 1,009,708 $ 1,009,708             3,297
Contributions by Noncontrolling Interests                 7,337
Distributions to Noncontrolling Interests                 (7,158)
Balance, end of year at Dec. 31, 2019     $ 37,280   $ 10,355,789 $ 227,837 $ (77,563)    
Balance, end of year at Dec. 31, 2019                 $ 1,183