Significant Transactions - (Tables)

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Summary of properties disposed by sale

Summarized information regarding apartment communities sold during the years ended December 31, 2017, 2016 and 2015 is set forth in the table below (dollars in thousands):

	2017	2016	2015
Real Estate portfolio:
Apartment communities sold	5	7	11
Apartment homes sold	2,291	3,045	3,855
Gain on disposition, net of tax	297,944	377,280	180,593
Consolidated partnerships served by the Asset Management business:
Apartment communities sold	2	1	—
Apartment homes sold	252	296	—
Gain on disposition, net of tax	1,615	16,510	—