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Real Estate Investments - Long Lived Asset Held-For-Sale (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Apr. 06, 2017	Oct. 13, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Long Lived Assets Held-for-sale [Line Items]
Gain on sale of real estate investments			$ 0	$ 124	$ 6,903	$ 124
CA undeveloped land
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$ 1,350
Gain on sale of real estate investments	580
Real Estate Selling Expenses	14
Arizona Warehouse Building [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 20,000
Gain on sale of real estate investments		9,981
Real Estate Selling Expenses		$ 112
Partnership Interest
Long Lived Assets Held-for-sale [Line Items]
Limited Partnership (LP) Ownership Interest					70.00%
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
Gain on sale of real estate investments	6,323
Real Estate Selling Expenses	1,156
Parent [Member] | 444 West Santa Clara Street
Long Lived Assets Held-for-sale [Line Items]
Gain on sale of real estate investments	4,427
Noncontrolling Interest [Member] | 444 West Santa Clara Street
Long Lived Assets Held-for-sale [Line Items]
Gain on sale of real estate investments	$ 1,896

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- Definition

Real Estate Selling Expenses

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

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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No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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