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Fair Value Measurements - Impairment of Real Estate Properties (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on Impairment	$ 24,825	$ 18,061
Fair Value	70,800	0
Prior period adjustments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on Impairment	(229)
Fair Value	0
Greenbrier Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on Impairment	22,770
Fair Value	56,300
Equity method investments at fair value	56,300
Honey Creek Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on Impairment	2,284
Fair Value	14,500
Equity method investments at fair value	$ 14,500
Janesville Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on Impairment		18,061
Fair Value		0
Equity method investments at fair value		$ 17,640
Expected Term | Greenbrier Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Holding period	10 years
Cap Rate | Greenbrier Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.110
Discount Rate | Greenbrier Mall | Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.115

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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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