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Recent Real Estate Transactions (Details)								12 Months Ended
	Dec. 24, 2015 USD ($) ft² Story	Aug. 28, 2015 USD ($) ft² Story	Aug. 26, 2015 USD ($) ft² Story	Aug. 13, 2015 USD ($) ft² Story	Aug. 08, 2015 USD ($) ft² Story	Apr. 24, 2015 USD ($)	Apr. 10, 2015 USD ($)	Dec. 31, 2015 USD ($) Property
Highlands Ranch, Colorado [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story	4
Rentable square feet | ft²	121,399
Purchase price of property acquired	$ 25,300,000
Occupancy rate	100.00%
Westminster, Colorado [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story		4
Rentable square feet | ft²		69,200
Purchase price of property acquired		$ 9,100,000
Occupancy rate		96.00%
Centennial, Colorado [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story			4
Rentable square feet | ft²			93,000
Purchase price of property acquired			$ 13,100,000
Occupancy rate			97.00%
Colorado Springs ,Colorado [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story				1
Rentable square feet | ft²				10,700
Occupancy rate				100.00%
Purchase price of property acquired				$ 2,900,000
Fargo, North Dakota [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story					2
Rentable square feet | ft²					36,500
Occupancy rate					86.40%
Purchase price of property acquired					$ 3,900,000
West Fargo Industrial [Member] | Residential Properties [Member]
Real Estate Properties [Line Items]
Number of story acquired | Story					7
Rentable square feet | ft²					152,154
Occupancy rate					97.60%
Purchase price of property acquired					$ 7,900,000
Seventeen Model Homes [Member] | Residential Properties [Member]
Real Estate Properties [Line Items]
Purchase price of property acquired								$ 5,700,000
Sparkys Self-Storage Portfolio, Disposal Group [Member]
Real Estate Properties [Line Items]
Business acquisition contributed revenue								1,800,000
Business acquisition operating expenses								666,000
Proceeds from sale of property							$ 34,000,000
Mortgage notes payable retired							16,900,000
Gain (loss) on sale of property							$ 4,700,000
Yucca Valley Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property						$ 1,500,000
Gain (loss) on sale of property						$ 1,000,000
Four Dubos Model Homes [Member] | Residential Properties [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property								2,700,000
Mortgage notes payable retired								1,100,000
Gain (loss) on sale of property								$ 473,000
Number of properties \ Property | Property								5

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Number of stories in a building.

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Area of a real estate property.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

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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 carrying amount of mortgage loans on real estate that were sold during the reporting period.

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

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