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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 [Member]
ERPOP [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
ERPOP [Member]
PARTIALLY OWNED PROPERTIES [Member]
ERPOP [Member]
Balance, beginning of year at Dec. 31, 2015     $ 37,280   $ 10,585,104 $ 221,379 $ (152,016)  
Balance, beginning of year at Dec. 31, 2015               $ 4,608
OP Unit Issuance:                
Conversion of OP Units held by Limited Partners into OP Units held by General Partner         3,726 (3,726)    
Exercise of EQR share options         35,833      
EQR's Employee Share Purchase Plan (ESPP)       $ 3,686        
Share-based employee compensation expense:                
EQR restricted shares         15,016      
EQR share options         3,432      
EQR ESPP discount         650      
Net income available to Units – General Partner   $ 4,289,072     4,289,072      
OP Units – General Partner distributions         (4,754,537)      
Offering costs         (314)      
Supplemental Executive Retirement Plan (SERP)         748      
Change in market value of Redeemable Limited Partners         115,093      
Adjustment for Limited Partners ownership in Operating Partnership         8,198 (8,198)    
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         3,726 (3,726)    
Equity compensation associated with Units – Limited Partners           18,180    
Limited Partners   171,511       171,511    
Units – Limited Partners distributions           (187,448)    
Change in carrying value of Redeemable Limited Partners           9,598    
Adjustment for Limited Partners ownership in Operating Partnership         8,198 (8,198)    
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)                
Unrealized holding gains (losses) arising during the year $ (3,915) (3,915)         (3,915)  
Losses reclassified into earnings from other comprehensive income (41,758) (41,758)         41,758  
Currency translation adjustments arising during the year 264 264         264  
PARTIALLY OWNED PROPERTIES                
Net income 4,480,104 4,480,104           16,430
Distributions to Noncontrolling Interests               (36,268)
Other               25,839
Balance, end of year at Dec. 31, 2016     37,280   10,305,707 221,297 (113,909)  
Balance, end 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    
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  
Currency translation adjustments arising during the year 0              
PARTIALLY OWNED PROPERTIES                
Net income 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    
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  
Currency translation adjustments arising during the year 0              
PARTIALLY OWNED PROPERTIES                
Net income $ 685,192 $ 685,192           2,718
Contributions by Noncontrolling Interests               125
Distributions to Noncontrolling Interests               (9,831)
Acquisitions of Noncontrolling Interests - Partially Owned Properties               13
Acquisition Noncontrolling Interests Partially Owned Properties               (13)
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)