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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.