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Fair Value Measurements - Impairment of Real Estate Properties (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) yr	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) yr mall	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) yr
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment	$ 14,600	$ 24,935	$ 84,644	$ 71,401	$ 67,532
Number of malls with impairment | mall			2
Fair Value	42,100		$ 42,100		81,350
Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment			84,644
Fair Value	42,100		42,100
Outlet Mall and Outparcel Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment			84,644
Janesville Mall
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net sales price	17,640		17,640
Janesville Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment			18,061
Fair Value	0		0
Cary Towne Center | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment			51,985
Fair Value	34,000		34,000
Vacant land | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment			14,598
Fair Value	$ 8,100		$ 8,100
Acadiana Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment					43,007
Fair Value					67,300
Fair value of equity method investments					67,300
Hickory Point Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment					24,525
Fair Value					$ 14,050
Expected Term | Cary Towne Center | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input | yr	10		10
Expected Term | Acadiana Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input | yr					10
Expected Term | Hickory Point Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input | yr					10
Cap Rate | Cary Towne Center | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.120		0.120
Cap Rate | Acadiana Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input					0.155
Cap Rate | Hickory Point Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input					0.180
Discount Rate | Cary Towne Center | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.13		0.13
Discount Rate | Acadiana Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input					0.1575
Discount Rate | Hickory Point Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input					0.190

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Fair value portion of investments accounted under the equity method.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

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