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Real Estate Assets (Summary of Properties Owned) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | $ 234,534 | $ 240,522
Garden Gateway Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2007 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 11,434 | 11,656
World Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [1] | Sep. 01, 2007 |
Location | [1] | San Bernardino, California |
Real Estate Assets Owned | [1] | $ 5,743 | 5,750
Regatta Square [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Oct. 01, 2007 |
Location |  | Denver, Colorado |
Real Estate Assets Owned |  |  | 1,836
Executive Office Park [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jul. 01, 2008 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 8,076 | 8,125
Waterman Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2008 |
Location |  | San Bernardino, California |
Real Estate Assets Owned |  | $ 5,624 | 5,753
Pacific Oaks Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Sep. 01, 2008 |
Location |  | Escondido, California |
Real Estate Assets Owned |  | $ 4,040 | 4,146
Morena Office Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jan. 01, 2009 |
Location |  | San Diego, California |
Real Estate Assets Owned |  | $ 4,870 | 5,079
Dakota Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | May 01, 2011 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 9,635 | 10,148
Rangewood Medical Office Building [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2009 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  | 2,054
Genesis Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2010 |
Location |  | San Diego, California |
Real Estate Assets Owned |  | $ 8,609 | 8,670
Grand Pacific Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2014 |
Location |  | Bismarck, ND |
Real Estate Assets Owned |  | $ 5,854 | 5,392
Yucca Valley Retail Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [1] | Sep. 01, 2011 |
Location | [1] | Yucca Valley, California |
Real Estate Assets Owned | [1] | $ 6,605 | 6,738
Port of San Diego Complex [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2011 |
Location |  | San Diego, California |
Real Estate Assets Owned |  | $ 13,888 | 14,153
Shoreline Medical Building [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | May 01, 2012 |
Location |  | Half Moon Bay, California |
Real Estate Assets Owned |  |  | 5,821
The Presidio [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Nov. 01, 2012 |
Location |  | Aurora, Colorado |
Real Estate Assets Owned |  | $ 6,415 | 6,609
West Fargo Industrial [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 7,455 | 7,632
300 N.P. [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 3,636 | 3,751
One Park Centre [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Westminster, Colorado |
Real Estate Assets Owned |  | $ 8,514 | 8,515
Union Terrace [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2014 |
Location |  | Lakewood, Colorado |
Real Estate Assets Owned |  | $ 8,287 | 8,276
Centennial Tech Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 13,431 | 14,157
Highland Court [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Centennial, Colorado |
Real Estate Assets Owned |  | $ 12,287 | 12,511
Arapahoe Service Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Centennial, Colorado |
Real Estate Assets Owned |  | $ 10,638 | 11,207
Shea Center II [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2015 |
Location |  | Highlands Ranch, Colorado |
Real Estate Assets Owned |  | $ 23,352 | 24,409
Office/Industrial Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | $ 191,288 | 205,708
Union Town Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 10,209 | 10,544
Research Parkway [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 2,686 | 2,776
Model Home Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | $ 43,246 | $ 34,814
Model Home Properties [Member] | Minimum [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jan. 01, 2011 |
Model Home Properties [Member] | Maximum [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jan. 01, 2017 |
[1] | Properties held for sale as of December 31, 2017

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- Definition Date real estate investment property was acquired for entities with a substantial portion of business acquiring and holding investment real estate, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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