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Sales of Properties (Details) - USD ($) $ in Thousands						3 Months Ended			9 Months Ended
	Jul. 01, 2020	Feb. 11, 2020	Aug. 29, 2019	Aug. 23, 2019	Jun. 20, 2019	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Sale of Property
Gross Sales Price									$ 25,115	$ 23,585
Gain on Sale of Real Estate, Net									14,568	3,643
Mortgage Prepaid on Sale									11,815	4,350
Prepayment costs on debt related to real estate						$ 58		$ 161	1,123	$ 201
Impairment due to casualty loss						430			$ 430
Hobby Lobby retail property, Onalaska, Wisconsin
Sale of Property
Gross Sales Price		$ 7,115
Gain on Sale of Real Estate, Net		4,252
Mortgage Prepaid on Sale		3,332
Prepayment costs on debt related to real estate		$ 290
CarMax retail property, Knoxville, Tennessee
Sale of Property
Gross Sales Price	$ 18,000
Gain on Sale of Real Estate, Net	10,316
Mortgage Prepaid on Sale	8,483
Prepayment costs on debt related to real estate	$ 833					$ 58	$ 775
Kmart retail property, Clemmons, North Carolina
Sale of Property
Gross Sales Price					$ 5,500
Gain on Sale of Real Estate, Net					1,099
Mortgage Prepaid on Sale					1,705
Prepayment costs on debt related to real estate					$ 40
Multi-tenant retail property, Athens, Georgia
Sale of Property
Gross Sales Price				$ 6,050
Gain on Sale of Real Estate, Net				1,045
Mortgage Prepaid on Sale				2,645
Prepayment costs on debt related to real estate				$ 161
Land - The Briarbrook Village Apartments, Wheaton, Illinois
Sale of Property
Gross Sales Price			$ 12,035
Gain on Sale of Real Estate, Net			$ 1,499
Consolidated Joint Venture | Kmart retail property, Clemmons, North Carolina
Sale of Property
Ownership interest in consolidated joint venture of the company (as a percent)					90.00%
Non-controlling interest's share of the gain					$ 422

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The parent entity's controlling interest held in a consolidated entity, expressed as a percentage.

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Gross proceeds received from the sale of real estate during the current period.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral upon sale of the property.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect 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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