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Financing Activity - Mortgage Loan Activity (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 0	$ 0	$ 4,768	$ 0
Capital City Mall, Camp Hill, Pennsylvania \| Commercial Real Estate \| Mortgages
Debt Instrument [Line Items]
Repayments of Debt	$ 58,500
Loss on debt extinguishment	$ 4,800
Wyoming Valley Mall \| Commercial Real Estate \| Mortgages
Debt Instrument [Line Items]
Debt default, amount		$ 73,100		$ 73,100