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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]
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, 2014     $ 50,000 $ 10,490,608 $ 214,411 $ (172,152)  
Balance, beginning of year at Dec. 31, 2014             $ 124,909
PREFERRED SHARES              
Partial redemption of 8.29% Series K Cumulative Redeemable     (12,720)        
OP Unit Issuance:              
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       4,966 (4,966)    
Exercise of EQR share options       59,508      
EQR's Employee Share Purchase Plan (ESPP)       4,404      
Conversion of restricted shares to restricted units       (70) 70    
Share-based employee compensation expense:              
EQR restricted shares       15,066      
EQR share options       3,756      
EQR ESPP discount       884      
Net income available to Units – General Partner   $ 863,277   863,277      
OP Units – General Partner distributions       (804,825)      
Offering costs       (79)      
Supplemental Executive Retirement Plan (SERP)       1,380      
Change in market value of Redeemable Limited Partners       (64,378)      
Adjustment for Limited Partners ownership in Operating Partnership       10,607 (10,607)    
LIMITED PARTNERS              
Issuance of restricted units to Noncontrolling Interests         3    
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       4,966 (4,966)    
Conversion of restricted shares to restricted units       (70) 70    
Equity compensation associated with Noncontrolling Interests         21,503    
Limited Partners   34,241     34,241    
Units – Limited Partners distributions         (31,604)    
Change in carrying value of Redeemable Limited Partners         (1,672)    
Adjustment for Limited Partners ownership in Operating Partnership       10,607 (10,607)    
Other comprehensive income (loss) – derivative instruments:              
Unrealized holding gains (losses) arising during the year $ 2,219 2,219       2,219  
Losses reclassified into earnings from other comprehensive income (18,244) (18,244)       18,244  
Other comprehensive income (loss) – foreign currency:              
Currency translation adjustments arising during the year (327) (327)       (327)  
PARTIALLY OWNED PROPERTIES              
Net income 908,018 908,018         3,657
Distributions to Noncontrolling Interests             (6,608)
Deconsolidation of previously consolidated Noncontrolling Interests             (117,350)
Balance, end of year at Dec. 31, 2015     37,280 10,585,104 221,379 (152,016)  
Balance, end 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 Noncontrolling Interests         1    
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       3,726 (3,726)    
Equity compensation associated with Noncontrolling Interests         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)    
Other comprehensive income (loss) – derivative instruments:              
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  
Other comprehensive income (loss) – foreign currency:              
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 Noncontrolling Interests         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)    
Other comprehensive income (loss) – derivative instruments:              
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  
Other comprehensive income (loss) – foreign currency:              
Currency translation adjustments arising during the year 0 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