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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Tables)
 12 Months Ended
Dec. 31, 2015
Entity Information [Line Items]  
Summary of real estate commitments
The following summarizes the Company’s real estate commitments at December 31, 2015 (dollars in thousands):
 
Number of
Properties
 
Costs Incurred
to Date (a)
 
Expected Costs
to Complete (unaudited)
 
 Average Ownership
Stake
Wholly-owned — under development
1
 
$
124,072

(b)
$
217,928

 
100
%
Wholly-owned — redevelopment
3
 
11,302

(b)
16,698

 
100
%
Joint ventures:
 
 
 
 
 
 
 
Unconsolidated joint ventures
4
 
497,350

 
81,979

(c)
Various

Participating loan investments
1
 
90,747

(d)
2,711

(e)
0
%
Preferred equity investments
5
 
136,327

(f)
—

 
48
%
Total
 
 
$
859,798

 
$
319,316