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Real Estate Assets (Summary of Properties Owned) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | $ 211,108 | $ 234,534
Garden Gateway Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2007 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 11,166 | 11,434
World Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Sep. 01, 2007 |
Location |  | San Bernardino, California |
Real Estate Assets Owned |  | $ 6,180 | 5,743
Executive Office Park [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jul. 01, 2008 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 7,976 | 8,076
Waterman Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2008 |
Location |  | San Bernardino, California |
Real Estate Assets Owned |  | $ 4,977 | 5,624
Pacific Oaks Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [1],[2] | Sep. 01, 2008 |
Location | [1],[2] | Escondido, California |
Real Estate Assets Owned | [1],[2] |  | 4,040
Morena Office Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [3] | Jan. 01, 2009 |
Location | [3] | San Diego, California |
Real Estate Assets Owned | [3] | $ 4,716 | 4,870
Genesis Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2010 |
Location |  | San Diego, California |
Real Estate Assets Owned |  | $ 8,449 | 8,609
Union Terrace [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2014 |
Location |  | Lakewood, Colorado |
Real Estate Assets Owned |  | $ 7,983 | 8,287
Dakota Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | May 01, 2011 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 9,139 | 9,635
Yucca Valley Retail Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [2],[4] | Sep. 01, 2011 |
Location | [2],[4] | Yucca Valley, California |
Real Estate Assets Owned | [2],[4] |  | 6,605
Arapahoe Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Centennial, Colorado |
Real Estate Assets Owned |  | $ 10,251 | 10,638
Port of San Diego Complex [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | [2],[5] | Dec. 01, 2011 |
Location | [2],[5] | San Diego, California |
Real Estate Assets Owned | [2],[5] |  | 13,888
The Presidio [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Nov. 01, 2012 |
Location |  | Aurora, Colorado |
Real Estate Assets Owned |  | $ 6,499 | 6,415
Grand Pacific Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2014 |
Location |  | Bismarck, North Dakota |
Real Estate Assets Owned |  | $ 5,814 | 5,854
Centennial Tech Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 12,960 | 13,431
Union Town Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2014 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 9,904 | 10,209
West Fargo Industrial [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 7,243 | 7,455
300 N.P. [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Fargo, North Dakota |
Real Estate Assets Owned |  | $ 3,543 | 3,636
Research Parkway [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 2,589 | 2,686
One Park Centre [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Westminster, Colorado |
Real Estate Assets Owned |  | $ 8,453 | 8,514
Highland Court [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Aug. 01, 2015 |
Location |  | Centennial, Colorado |
Real Estate Assets Owned |  | $ 11,845 | 12,287
Shea Center II [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Dec. 01, 2015 |
Location |  | Highlands Ranch, Colorado |
Real Estate Assets Owned |  | $ 22,658 | 23,352
Office/Industrial Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | 162,345 | 191,288
Model Home Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned |  | $ 48,763 | $ 43,246
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, 2018 |
[1] | Pacific Oaks Plaza was sold on December 27, 2018.
[2] | Property held for sale as of December 31, 2017.
[3] | Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.
[4] | Yucca Valley Retail Center was sold on December 31, 2018.
[5] | Port of San Diego Complex was sold on December 20, 2018.

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