Real Estate Investments Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 01, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Total liabilities assumed	$ 0		$ 0
Equity One Inc. [Member]
Business Acquisition [Line Items]
Land		$ 3,093,797
Building and improvements		2,802,319
Properties in development		70,179
Properties held for sale		19,600
Investments in unconsolidated real estate partnerships		103,566
Real estate assets		6,089,461
Cash, accounts receivable and other assets		112,211
Intangible assets		500,645
Total assets acquired		6,702,317
Notes payable		757,399
Accounts payable, accrued expenses, and other liabilities		120,370
Lease intangible liabilities		631,443
Total liabilities assumed		1,509,212
Total purchase price		$ 5,193,105