Real Estate Investments Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Mar. 01, 2017
Business Acquisition [Line Items]
Total liabilities assumed	$ 9,700	$ 0
Equity One Inc. [Member]
Business Acquisition [Line Items]
Land			$ 2,865,053
Building and improvements			2,619,163
Properties in development			68,744
Properties held for sale			19,600
Investments in unconsolidated real estate partnerships			99,666
Real estate assets			5,672,226
Cash, accounts receivable and other assets			112,909
Intangible assets			458,877
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			332,384
Total assets acquired			6,576,396
Notes payable			757,399
Accounts payable, accrued expenses, and other liabilities			122,217
Lease intangible liabilities			503,675
Total liabilities assumed			1,383,291
Total purchase price			$ 5,193,105