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Real Estate Investments - Long Lived Asset Held-For-Sale (Details) - USD ($)		3 Months Ended
	Apr. 06, 2017	Mar. 31, 2017	Dec. 31, 2016	Feb. 22, 2016
Long Lived Assets Held-for-sale [Line Items]
Purchase and Sales Agreement, Holdback Amount				$ 3,000,000
Depreciation Expense on Reclassified Assets		$ 26,000
Long-lived assets held-for-sale, gross		1,698,180,000	$ 1,666,381,000
Intangible assets		25,090,000	23,989,000
Subtotal		56,170,000	62,193,000
Less accumulated depreciation and amortization		10,246,000	11,734,000
Total		45,924,000	$ 50,459,000
Land, building and improvements and intangibles [Member]
Long Lived Assets Held-for-sale [Line Items]
Subtotal		6,085,000
Less accumulated depreciation and amortization		1,809,000
Total		4,276,000
Land
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held-for-sale, gross		1,956,000
Buildings and improvements
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held-for-sale, gross		3,980,000
Intangibles
Long Lived Assets Held-for-sale [Line Items]
Intangible assets		$ 149,000
Scenario, Forecast | CA undeveloped land
Long Lived Assets Held-for-sale [Line Items]
Gain on sale of real estate investments	$ 586,000
Partnership Interest
Long Lived Assets Held-for-sale [Line Items]
Limited Partnership (LP) Ownership Interest		70.00%
Partnership Interest | Scenario, Forecast | 444 West Santa Clara Street
Long Lived Assets Held-for-sale [Line Items]
Gain on sale of real estate investments	6,200,000
Purchase and Sales Agreement, Holdback Amount	750
Subsequent event | CA undeveloped land
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	1,350,000
Subsequent event | Partnership Interest | 444 West Santa Clara Street
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$ 11,000,000

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- Definition

Purchase and Sales Agreement, Holdback Amount

+ References

No definition available.

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- Definition

For the asset that is reclassified back to held and use from held-for-sale, the depreciation expense recognized when the asset is reclassified. This represents the difference between the carrying value at the time the decision to reclassify is made and the carrying amount that the asset would have had if it had never been classified as held for sale (including consideration of depreciation expense).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 7
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

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.

+ References

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The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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