Acquisitions, Dispositions and Held for Sale (Details) - USD ($) $ in Thousands		1 Months Ended						3 Months Ended				12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Jul. 31, 2015	Jun. 30, 2015	Apr. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Jun. 18, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment								$ 19,685			$ 0
Held for sale	[1]	$ 18,721	$ 0					18,721	$ 0			$ 0
Gross Sales Price												104,860
Net Proceeds												103,537
Gain												21,331
The Crossings at Marshalls Creek
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Held for sale		$ 18,721						$ 18,721
Real estate held-for-sale as a percentage of total assets		0.30%						0.30%
River Ridge Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage sold		75.00%
Loss on impairment		$ 9,510
Mayfaire Community Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment									397
Gross Sales Price			56,300
Net Proceeds			55,955
Gain			0
Chapel Hill Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment									1,914
Gross Sales Price			2,300
Net Proceeds			2,178
Gain			$ 0
Waynesville Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Sales Price				$ 14,500
Net Proceeds				14,289
Gain				$ 5,071
Madison Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Sales Price					$ 5,700
Net Proceeds					5,472
Gain					$ 2,769
Eastgate Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Sales Price						$ 21,060
Net Proceeds						20,688
Gain						13,491
Earn out proceeds, amount earned									625
Earn out proceeds						1,740
Proceeds from lease of tenant space									$ 574
Mortgage loan assumed at sale						$ 14,570
Madison Square
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment										$ 2,620
Gross Sales Price							$ 5,000
Net Proceeds							4,955
Gain							$ 0
Mayfaire Community Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, ownership percentage													100.00%
Revenue from acquiree included in consolidated financial statements												8,982
Income from acquiree included in consolidated financial statements												$ 410
Sales price													$ 191,988

[1] As of March 31, 2016, include $517,532 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $435,213 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 5.