Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended								12 Months Ended
	Jan. 14, 2016	Jan. 06, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues			$ 256,743	$ 242,451	$ 247,423	$ 247,045	$ 272,000	$ 253,367	$ 259,904	$ 256,000	$ 993,662	$ 1,041,271	$ 1,288,149
Net income attributable to the Company			$ 32,751	$ 17,498	$ 26,638	$ 69,243	$ 37,128	$ 13,730	$ 45,222	$ 420,915	$ 146,130	$ 516,995	$ 487,562
Net income attributable to common stockholders (dollars per share)			$ 0.23	$ 0.12	$ 0.19	$ 0.48	$ 0.26	$ 0.09	$ 0.31	$ 2.77	$ 1.02	$ 3.52	$ 3.08
Net income attributable to common stockholders (dollars per share)			$ 0.23	$ 0.12	$ 0.19	$ 0.48	$ 0.26	$ 0.09	$ 0.31	$ 2.76	$ 1.02	$ 3.52	$ 3.08
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets											$ 42,446	$ 415,348	$ 378,248
Joint venture | Arrowhead Towne Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets		$ 101,629
Joint venture | MAC Heitman Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets	$ 340,734