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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances $ 605,889    
Initial Cost to the Company [Abstract]      
Land 159,039    
Building and Improvements 1,369,493    
Subsequent Capitalized Costs 234,034    
Total Real Estate 1,762,566    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 159,039    
Building and Improvements 1,603,527    
Accumulated Depreciation 199,849    
Net Book Value of Real Estate 1,562,717 921,937 1,389,767
Depreciable Lives    [1]    
Real Estate [Roll Forward]      
Balance at beginning of year 1,084,060 1,755,919 1,738,649
Additions [Abstract]      
Acquisitions and improvements 710,642 535,249 64,968
Impairment on land held for development 0 (609) 0
Real estate sold, disposed, impaired or held for sale (32,136) (1,206,499) (47,698)
Balance at close of year 1,762,566 1,084,060 1,755,919
Accumulated Depreciation [Roll Forward]      
Balance at beginning of year 162,123 366,152 336,759
Depreciation expense 50,421 32,971 19,859
Depreciation expense - discontinued operations 316 43,578 47,788
Real estate sold, disposed, impaired or held for sale (13,011) (280,578) (38,254)
Balance at close of year 199,849 162,123 366,152
ARIZONA | Hayden Ferry Lakeside I [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 22,000    
Initial Cost to the Company [Abstract]      
Land 2,871    
Building and Improvements 30,430    
Subsequent Capitalized Costs 5,565    
Total Real Estate 38,866    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 2,871    
Building and Improvements 35,995    
Accumulated Depreciation 2,443    
Net Book Value of Real Estate 36,423    
Year Acquired 2011    
Year Constructed 2002    
ARIZONA | Hayden Ferry Lakeside II [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 48,125    
Initial Cost to the Company [Abstract]      
Land 3,612    
Building and Improvements 69,248    
Subsequent Capitalized Costs 4,301    
Total Real Estate 77,161    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 3,612    
Building and Improvements 73,549    
Accumulated Depreciation 2,617    
Net Book Value of Real Estate 74,544    
Year Acquired 2012    
Year Constructed 2007    
Depreciable Lives    [1]    
ARIZONA | Hayden Ferry Lakeside III, IV and V [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 9,046    
Building and Improvements 8,561    
Subsequent Capitalized Costs 405    
Total Real Estate 18,012    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 9,046    
Building and Improvements 8,966    
Accumulated Depreciation 90    
Net Book Value of Real Estate 17,922    
Year Acquired 2012    
Year Constructed 2007    
Depreciable Lives    [1]    
ARIZONA | Squaw Peak Corporate Center [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 5,800    
Building and Improvements 35,144    
Subsequent Capitalized Costs 6,966    
Total Real Estate 47,910    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 5,800    
Building and Improvements 42,110    
Accumulated Depreciation 11,007    
Net Book Value of Real Estate 36,903    
Year Acquired 2004    
Depreciable Lives    [1]    
ARIZONA | Squaw Peak Corporate Center [Member] | Start [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 1999    
ARIZONA | Squaw Peak Corporate Center [Member] | End [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 2000    
ARIZONA | Mesa Corporate Center [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 3,353    
Building and Improvements 15,243    
Subsequent Capitalized Costs 1,290    
Total Real Estate 19,886    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 3,353    
Building and Improvements 16,533    
Accumulated Depreciation 3,636    
Net Book Value of Real Estate 16,250    
Year Acquired 2005    
Year Constructed 2000    
Depreciable Lives    [1]    
ARIZONA | Tempe Gateway [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 6,937    
Building and Improvements 46,170    
Subsequent Capitalized Costs 6,164    
Total Real Estate 59,271    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 6,937    
Building and Improvements 52,334    
Accumulated Depreciation 2    
Net Book Value of Real Estate 59,269    
Year Acquired 2012    
Year Constructed 2009    
Depreciable Lives    [1]    
FLORIDA | Hillsboro Center V [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 9,412    
Initial Cost to the Company [Abstract]      
Land 1,325    
Building and Improvements 12,249    
Subsequent Capitalized Costs 3,655    
Total Real Estate 17,229    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,325    
Building and Improvements 15,904    
Accumulated Depreciation 6,611    
Net Book Value of Real Estate 10,618    
Year Acquired 1998    
Year Constructed 1985    
Depreciable Lives    [1]    
FLORIDA | Hillsboro Center I-IV [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 6,417    
Initial Cost to the Company [Abstract]      
Land 1,129    
Building and Improvements 7,734    
Subsequent Capitalized Costs 2,837    
Total Real Estate 11,700    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,129    
Building and Improvements 10,571    
Accumulated Depreciation 4,083    
Net Book Value of Real Estate 7,617    
Year Acquired 1998    
Year Constructed 1985    
Depreciable Lives    [1]    
FLORIDA | 245 Riverside [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 9,250    
Initial Cost to the Company [Abstract]      
Land 6,556    
Building and Improvements 8,050    
Subsequent Capitalized Costs 1,305    
Total Real Estate 15,911    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 6,556    
Building and Improvements 9,355    
Accumulated Depreciation 601    
Net Book Value of Real Estate 15,310    
Year Acquired 2011    
Year Constructed 2003    
Depreciable Lives    [1]    
FLORIDA | Stein Mart Building [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 11,517    
Initial Cost to the Company [Abstract]      
Land 1,653    
Building and Improvements 16,636    
Subsequent Capitalized Costs 4,932    
Total Real Estate 23,221    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,653    
Building and Improvements 21,568    
Accumulated Depreciation 6,270    
Net Book Value of Real Estate 16,951    
Year Acquired 2005    
Year Constructed 1985    
Depreciable Lives    [1]    
FLORIDA | Riverplace South [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 2,316    
Building and Improvements 5,412    
Subsequent Capitalized Costs 2,938    
Total Real Estate 10,666    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 2,316    
Building and Improvements 8,350    
Accumulated Depreciation 2,924    
Net Book Value of Real Estate 7,742    
Year Acquired 2005    
Year Constructed 1981    
Depreciable Lives    [1]    
FLORIDA | Westshore Corporate Center [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 15,646    
Initial Cost to the Company [Abstract]      
Land 0    
Building and Improvements 17,532    
Subsequent Capitalized Costs 2,219    
Total Real Estate 19,751    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 0    
Building and Improvements 19,751    
Accumulated Depreciation 161    
Net Book Value of Real Estate 19,590    
Year Acquired 2012    
Year Constructed 1988    
Depreciable Lives    [1]    
FLORIDA | Bank of America Center [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 33,875    
Initial Cost to the Company [Abstract]      
Land 8,882    
Building and Improvements 38,598    
Subsequent Capitalized Costs 7,204    
Total Real Estate 54,684    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 8,882    
Building and Improvements 45,802    
Accumulated Depreciation 3,311    
Net Book Value of Real Estate 51,373    
Year Acquired 2011    
Year Constructed 1987    
Depreciable Lives    [1]    
FLORIDA | Citrus Center [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 22,034    
Initial Cost to the Company [Abstract]      
Land 4,000    
Building and Improvements 26,712    
Subsequent Capitalized Costs 7,243    
Total Real Estate 37,955    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 4,000    
Building and Improvements 33,955    
Accumulated Depreciation 10,170    
Net Book Value of Real Estate 27,785    
Year Acquired 2003    
Year Constructed 1971    
Depreciable Lives    [1]    
FLORIDA | Corporate Center Four [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 22,500    
Initial Cost to the Company [Abstract]      
Land 0    
Building and Improvements 31,775    
Subsequent Capitalized Costs 7,803    
Total Real Estate 39,578    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 0    
Building and Improvements 39,578    
Accumulated Depreciation 2,897    
Net Book Value of Real Estate 36,681    
Year Acquired 2011    
Year Constructed 2008    
Depreciable Lives    [1]    
FLORIDA | Cypress Center I - III [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 12,088    
Initial Cost to the Company [Abstract]      
Land 4,710    
Building and Improvements 12,180    
Subsequent Capitalized Costs 4,169    
Total Real Estate 21,059    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 4,710    
Building and Improvements 16,349    
Accumulated Depreciation 2,183    
Net Book Value of Real Estate 18,876    
Year Acquired 2011    
Year Constructed 1982    
Depreciable Lives    [1]    
FLORIDA | The Pointe [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 23,500    
Initial Cost to the Company [Abstract]      
Land 5,293    
Building and Improvements 30,836    
Subsequent Capitalized Costs 4,518    
Total Real Estate 40,647    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 5,293    
Building and Improvements 35,354    
Accumulated Depreciation 1,540    
Net Book Value of Real Estate 39,107    
Year Acquired 2012    
Year Constructed 1982    
Depreciable Lives    [1]    
GEORGIA | Lakewood II [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 1,195    
Building and Improvements 575    
Subsequent Capitalized Costs 1,216    
Total Real Estate 2,986    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,195    
Building and Improvements 1,791    
Accumulated Depreciation 193    
Net Book Value of Real Estate 2,793    
Year Acquired 2010    
Year Constructed 1986    
Depreciable Lives    [1]    
GEORGIA | 3344 Peachtree [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 84,733    
Initial Cost to the Company [Abstract]      
Land 7,472    
Building and Improvements 127,583    
Subsequent Capitalized Costs 10,468    
Total Real Estate 145,523    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 7,472    
Building and Improvements 138,051    
Accumulated Depreciation 9,232    
Net Book Value of Real Estate 136,291    
Year Acquired 2011    
Year Constructed 2008    
Depreciable Lives    [1]    
GEORGIA | Two Ravinia Drive [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 22,100    
Initial Cost to the Company [Abstract]      
Land 3,187    
Building and Improvements 32,948    
Subsequent Capitalized Costs 7,493    
Total Real Estate 43,628    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 3,187    
Building and Improvements 40,441    
Accumulated Depreciation 3,154    
Net Book Value of Real Estate 40,474    
Year Acquired 2011    
Year Constructed 1987    
Depreciable Lives    [1]    
GEORGIA | Waterstone [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 859    
Building and Improvements 7,207    
Subsequent Capitalized Costs 1,538    
Total Real Estate 9,604    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 859    
Building and Improvements 8,745    
Accumulated Depreciation 3,967    
Net Book Value of Real Estate 5,637    
Year Acquired 1995    
Year Constructed 1987    
Depreciable Lives    [1]    
GEORGIA | Meridian [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 994    
Building and Improvements 9,547    
Subsequent Capitalized Costs 3,467    
Total Real Estate 14,008    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 994    
Building and Improvements 13,014    
Accumulated Depreciation 5,762    
Net Book Value of Real Estate 8,246    
Year Acquired 1997    
Year Constructed 1985    
Depreciable Lives    [1]    
GEORGIA | Peachtree Dunwoody Pavilion [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 26,953    
Initial Cost to the Company [Abstract]      
Land 9,373    
Building and Improvements 24,579    
Subsequent Capitalized Costs 7,922    
Total Real Estate 41,874    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 9,373    
Building and Improvements 32,501    
Accumulated Depreciation 8,236    
Net Book Value of Real Estate 33,638    
Year Acquired 2003    
Depreciable Lives    [1]    
GEORGIA | Peachtree Dunwoody Pavilion [Member] | Start [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 1976    
GEORGIA | Peachtree Dunwoody Pavilion [Member] | End [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 1980    
GEORGIA | Capital City Plaza [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 33,489    
Initial Cost to the Company [Abstract]      
Land 3,625    
Building and Improvements 57,218    
Subsequent Capitalized Costs 4,796    
Total Real Estate 65,639    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 3,625    
Building and Improvements 62,014    
Accumulated Depreciation 14,614    
Net Book Value of Real Estate 51,025    
Year Acquired 2004    
Year Constructed 1989    
Depreciable Lives    [1]    
MISSISSIPPI | City Centre [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 267    
Building and Improvements 1,676    
Subsequent Capitalized Costs 5,949    
Total Real Estate 7,892    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 267    
Building and Improvements 7,625    
Accumulated Depreciation 0    
Net Book Value of Real Estate 7,892    
Year Acquired 1995    
Depreciable Lives    [1]    
MISSISSIPPI | City Centre [Member] | Second Major Renovation [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 2005 [2]    
MISSISSIPPI | City Centre [Member] | First Major Renovation [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 1987 [2]    
NORTH CAROLINA | Carmel Crossing [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 10,000    
Initial Cost to the Company [Abstract]      
Land 4,541    
Building and Improvements 13,340    
Subsequent Capitalized Costs 4,430    
Total Real Estate 22,311    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 4,541    
Building and Improvements 17,770    
Accumulated Depreciation 2,386    
Net Book Value of Real Estate 19,925    
Year Acquired 2010    
Year Constructed 1995    
Depreciable Lives    [1]    
NORTH CAROLINA | Hearst Tower [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 4,417    
Building and Improvements 200,287    
Subsequent Capitalized Costs 19,923    
Total Real Estate 224,627    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 4,417    
Building and Improvements 220,210    
Accumulated Depreciation 4,614    
Net Book Value of Real Estate 220,013    
Year Acquired 2012    
Year Constructed 2002    
Depreciable Lives    [1]    
NORTH CAROLINA | 525 North Tryon [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 5,108    
Building and Improvements 34,103    
Subsequent Capitalized Costs 6,422    
Total Real Estate 45,633    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 5,108    
Building and Improvements 40,525    
Accumulated Depreciation 188    
Net Book Value of Real Estate 45,445    
Year Acquired 2012    
Year Constructed 1998    
Depreciable Lives    [1]    
NORTH CAROLINA | NASCAR Plaza [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 42,977    
Initial Cost to the Company [Abstract]      
Land 0    
Building and Improvements 76,790    
Subsequent Capitalized Costs 10,560    
Total Real Estate 87,350    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 0    
Building and Improvements 87,350    
Accumulated Depreciation 2    
Net Book Value of Real Estate 87,348    
Year Acquired 2012    
Year Constructed 2009    
Depreciable Lives    [1]    
PENNSYLVANIA | Two Liberty Place [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 90,200    
Initial Cost to the Company [Abstract]      
Land 32,587    
Building and Improvements 97,593    
Subsequent Capitalized Costs 17,140    
Total Real Estate 147,320    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 32,587    
Building and Improvements 114,733    
Accumulated Depreciation 8,144    
Net Book Value of Real Estate 139,176    
Year Acquired 2011    
Year Constructed 1990    
Depreciable Lives    [1]    
SOUTH CAROLINA | Atrium at Stoneridge [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 155    
Building and Improvements 1,388    
Subsequent Capitalized Costs 1,739    
Total Real Estate 3,282    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 155    
Building and Improvements 3,127    
Accumulated Depreciation 1,086    
Net Book Value of Real Estate 2,196    
Year Acquired 1998    
Year Constructed 1986    
Depreciable Lives    [1]    
TENNESSEE | Morgan Keegan Tower [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 10,419    
Initial Cost to the Company [Abstract]      
Land 0    
Building and Improvements 18,588    
Subsequent Capitalized Costs 4,236    
Total Real Estate 22,824    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 0    
Building and Improvements 22,824    
Accumulated Depreciation 826    
Net Book Value of Real Estate 21,998    
Year Acquired 1997    
Year Constructed 1985    
Depreciable Lives    [1]    
TENNESSEE | Bank of America Plaza [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 1,464    
Building and Improvements 28,712    
Subsequent Capitalized Costs 11,700    
Total Real Estate 41,876    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,464    
Building and Improvements 40,412    
Accumulated Depreciation 14,407    
Net Book Value of Real Estate 27,469    
Year Acquired 2001    
Year Constructed 1977    
Depreciable Lives    [1]    
TEXAS | 400 North Belt [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 419    
Building and Improvements 10,021    
Subsequent Capitalized Costs 3,841    
Total Real Estate 14,281    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 419    
Building and Improvements 13,862    
Accumulated Depreciation 5,162    
Net Book Value of Real Estate 9,119    
Year Acquired 1996    
Year Constructed 1982    
Depreciable Lives    [1]    
TEXAS | Woodbranch [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 303    
Building and Improvements 3,805    
Subsequent Capitalized Costs 2,931    
Total Real Estate 7,039    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 303    
Building and Improvements 6,736    
Accumulated Depreciation 3,179    
Net Book Value of Real Estate 3,860    
Year Acquired 1996    
Year Constructed 1982    
Depreciable Lives    [1]    
TEXAS | Honeywell [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 856    
Building and Improvements 15,235    
Subsequent Capitalized Costs 4,360    
Total Real Estate 20,451    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 856    
Building and Improvements 19,595    
Accumulated Depreciation 7,093    
Net Book Value of Real Estate 13,358    
Year Acquired 1997    
Year Constructed 1983    
Depreciable Lives    [1]    
TEXAS | Schlumberger [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 1,013    
Building and Improvements 11,102    
Subsequent Capitalized Costs 4,629    
Total Real Estate 16,744    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,013    
Building and Improvements 15,731    
Accumulated Depreciation 7,747    
Net Book Value of Real Estate 8,997    
Year Acquired 1998    
Year Constructed 1983    
Depreciable Lives    [1]    
TEXAS | One Commerce Green [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 17,968    
Initial Cost to the Company [Abstract]      
Land 489    
Building and Improvements 37,307    
Subsequent Capitalized Costs 5,751    
Total Real Estate 43,547    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 489    
Building and Improvements 43,058    
Accumulated Depreciation 17,871    
Net Book Value of Real Estate 25,676    
Year Acquired 1998    
Year Constructed 1983    
Depreciable Lives    [1]    
TEXAS | Comerica Bank Building [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 12,834    
Initial Cost to the Company [Abstract]      
Land 1,921    
Building and Improvements 21,222    
Subsequent Capitalized Costs 3,526    
Total Real Estate 26,669    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,921    
Building and Improvements 24,748    
Accumulated Depreciation 9,765    
Net Book Value of Real Estate 16,904    
Year Acquired 1998    
Year Constructed 1983    
Depreciable Lives    [1]    
TEXAS | 550 Greens Parkway [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 1,006    
Building and Improvements 8,061    
Subsequent Capitalized Costs 440    
Total Real Estate 9,507    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 1,006    
Building and Improvements 8,501    
Accumulated Depreciation 2,632    
Net Book Value of Real Estate 6,875    
Year Acquired 2001    
Year Constructed 1999    
Depreciable Lives    [1]    
TEXAS | 5300 Memorial Building [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 11,387    
Initial Cost to the Company [Abstract]      
Land 682    
Building and Improvements 11,744    
Subsequent Capitalized Costs 3,643    
Total Real Estate 16,069    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 682    
Building and Improvements 15,387    
Accumulated Depreciation 5,152    
Net Book Value of Real Estate 10,917    
Year Acquired 2002    
Year Constructed 1982    
Depreciable Lives    [1]    
TEXAS | Town and Country [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 6,465    
Initial Cost to the Company [Abstract]      
Land 436    
Building and Improvements 8,205    
Subsequent Capitalized Costs 4,170    
Total Real Estate 12,811    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 436    
Building and Improvements 12,375    
Accumulated Depreciation 3,889    
Net Book Value of Real Estate 8,922    
Year Acquired 2002    
Year Constructed 1982    
Depreciable Lives    [1]    
TEXAS | Phoenix Tower [Member]
     
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrances 0    
Initial Cost to the Company [Abstract]      
Land 9,187    
Building and Improvements 98,147    
Subsequent Capitalized Costs 8,230    
Total Real Estate 115,564    
Gross Amounts at Which Carried at Close of Period [Abstract]      
Land 9,187    
Building and Improvements 106,377    
Accumulated Depreciation 2    
Net Book Value of Real Estate $ 115,562    
Year Acquired 2012    
Year Constructed 1984    
Depreciable Lives    [1]    
TEXAS | Phoenix Tower [Member] | First Major Renovation [Member]
     
Gross Amounts at Which Carried at Close of Period [Abstract]      
Year Constructed 2011 [2]    
[1] Depreciation of buildings and improvements is calculated over lives ranging from the life of the lease to 40 years.
[2] The dates of major renovations.