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Real Estate and Accumulated Depreciation (Schedule of Properties) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 998,748      
Initial Cost to Company        
Land and Improvements 355,598      
Buildings and Improvements 3,030,115      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (13,142)      
Building and Improvements less Cost of Sales, Transfers and Other 442,415      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 342,456      
Building and Improvements less Cost of Sales, Transfers and Other 3,472,530      
Total 3,814,986 $ 2,606,343 $ 2,619,488 $ 2,164,815
Accumulated Depreciation 215,856 $ 359,422 $ 324,543 $ 257,151
OPERATING PROPERTIES        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 998,748      
Initial Cost to Company        
Land and Improvements 300,219      
Buildings and Improvements 3,030,115      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 5,683      
Building and Improvements less Cost of Sales, Transfers and Other 312,361      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 305,902      
Building and Improvements less Cost of Sales, Transfers and Other 3,342,476      
Total 3,648,378      
Accumulated Depreciation 215,856      
OPERATING PROPERTIES | Austin, TX | Colorado Tower        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 119,069      
Initial Cost to Company        
Land and Improvements 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 1,600      
Building and Improvements less Cost of Sales, Transfers and Other 118,455      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 1,600      
Building and Improvements less Cost of Sales, Transfers and Other 118,455      
Total 120,055      
Accumulated Depreciation $ 9,669      
Life on Which Depreciation in 2016 Statement of Operations is Computed 30 years      
OPERATING PROPERTIES | Austin, TX | 816 Congress        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 84,231      
Initial Cost to Company        
Land and Improvements 6,817      
Buildings and Improvements 89,891      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 3,282      
Building and Improvements less Cost of Sales, Transfers and Other 16,170      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 10,099      
Building and Improvements less Cost of Sales, Transfers and Other 106,061      
Total 116,160      
Accumulated Depreciation $ 14,767      
Life on Which Depreciation in 2016 Statement of Operations is Computed 42 years      
OPERATING PROPERTIES | Austin, TX | Research Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 4,373      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 801      
Building and Improvements less Cost of Sales, Transfers and Other 36,766      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 5,174      
Building and Improvements less Cost of Sales, Transfers and Other 36,766      
Total 41,940      
Accumulated Depreciation $ 549      
Life on Which Depreciation in 2016 Statement of Operations is Computed 30 years      
OPERATING PROPERTIES | Austin, TX | One Eleven Congress        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 130,002      
Initial Cost to Company        
Land and Improvements 33,841      
Buildings and Improvements 201,707      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 4,029      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 33,841      
Building and Improvements less Cost of Sales, Transfers and Other 205,736      
Total 239,577      
Accumulated Depreciation $ 1,839      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Austin, TX | San Jacinto Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 102,562      
Initial Cost to Company        
Land and Improvements 34,068      
Buildings and Improvements 176,535      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 144      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 34,068      
Building and Improvements less Cost of Sales, Transfers and Other 176,679      
Total 210,747      
Accumulated Depreciation $ 1,500      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Atlanta, GA        
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other      
OPERATING PROPERTIES | Atlanta, GA | Northpark Town Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 22,350      
Buildings and Improvements 295,825      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 22,101      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 22,350      
Building and Improvements less Cost of Sales, Transfers and Other 317,926      
Total 340,276      
Accumulated Depreciation $ 27,266      
Life on Which Depreciation in 2016 Statement of Operations is Computed 39 years      
OPERATING PROPERTIES | Atlanta, GA | Promenade        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 104,997      
Initial Cost to Company        
Land and Improvements 13,439      
Buildings and Improvements 102,790      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 35,664      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 13,439      
Building and Improvements less Cost of Sales, Transfers and Other 138,454      
Total 151,893      
Accumulated Depreciation $ 33,382      
Life on Which Depreciation in 2016 Statement of Operations is Computed 34 years      
OPERATING PROPERTIES | Atlanta, GA | The American Cancer Society Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 127,451      
Initial Cost to Company        
Land and Improvements 5,226      
Buildings and Improvements 67,370      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 34,165      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 5,226      
Building and Improvements less Cost of Sales, Transfers and Other 101,535      
Total 106,761      
Accumulated Depreciation $ 72,422      
Life on Which Depreciation in 2016 Statement of Operations is Computed 25 years      
OPERATING PROPERTIES | Atlanta, GA | Meridian Mark Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 24,427      
Initial Cost to Company        
Land and Improvements 2,219      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 30,024      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 2,219      
Building and Improvements less Cost of Sales, Transfers and Other 30,024      
Total 32,243      
Accumulated Depreciation $ 18,726      
Life on Which Depreciation in 2016 Statement of Operations is Computed 30 years      
OPERATING PROPERTIES | Atlanta, GA | 3344 Peachtree        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 80,258      
Initial Cost to Company        
Land and Improvements 16,110      
Buildings and Improvements 176,153      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other (57)      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 16,110      
Building and Improvements less Cost of Sales, Transfers and Other 176,096      
Total 192,206      
Accumulated Depreciation $ 1,673      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Atlanta, GA | One Buckhead Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 17,011      
Buildings and Improvements 171,930      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 41      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 17,011      
Building and Improvements less Cost of Sales, Transfers and Other 171,971      
Total 188,982      
Accumulated Depreciation $ 1,651      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Atlanta, GA | 3350 Peachtree        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 16,836      
Buildings and Improvements 109,166      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other (988)      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 16,836      
Building and Improvements less Cost of Sales, Transfers and Other 108,178      
Total 125,014      
Accumulated Depreciation $ 1,038      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Atlanta, GA | 3348 Peachtree        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 6,707      
Buildings and Improvements 69,723      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other (30)      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 6,707      
Building and Improvements less Cost of Sales, Transfers and Other 69,693      
Total 76,400      
Accumulated Depreciation $ 749      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Atlanta, GA | Two Buckhead Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 53,515      
Initial Cost to Company        
Land and Improvements 18,053      
Buildings and Improvements 74,547      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 204      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 18,053      
Building and Improvements less Cost of Sales, Transfers and Other 74,751      
Total 92,804      
Accumulated Depreciation $ 760      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Charlotte, NC | Fifth Third Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 148,867      
Initial Cost to Company        
Land and Improvements 22,591      
Buildings and Improvements 180,430      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 11,414      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 22,591      
Building and Improvements less Cost of Sales, Transfers and Other 191,844      
Total 214,435      
Accumulated Depreciation $ 15,891      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Charlotte, NC | Hearst Tower        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 9,977      
Buildings and Improvements 323,299      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 1,510      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 9,977      
Building and Improvements less Cost of Sales, Transfers and Other 324,809      
Total 334,786      
Accumulated Depreciation $ 2,937      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Charlotte, NC | NASCAR Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 51      
Buildings and Improvements 115,238      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 562      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 51      
Building and Improvements less Cost of Sales, Transfers and Other 115,800      
Total 115,851      
Accumulated Depreciation $ 1,109      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Tampa, FL | Corporate Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 7,298      
Buildings and Improvements 272,148      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 1,705      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 7,298      
Building and Improvements less Cost of Sales, Transfers and Other 273,853      
Total 281,151      
Accumulated Depreciation $ 2,827      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Tampa, FL | The Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 23,369      
Initial Cost to Company        
Land and Improvements 9,404      
Buildings and Improvements 54,694      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 41      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 9,404      
Building and Improvements less Cost of Sales, Transfers and Other 54,735      
Total 64,139      
Accumulated Depreciation $ 738      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Tampa, FL | Harborview Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 10,800      
Buildings and Improvements 39,136      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 436      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 10,800      
Building and Improvements less Cost of Sales, Transfers and Other 39,572      
Total 50,372      
Accumulated Depreciation $ 515      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Orlando, FL | Bank of America Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 7,121      
Buildings and Improvements 66,129      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 266      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 7,121      
Building and Improvements less Cost of Sales, Transfers and Other 66,395      
Total 73,516      
Accumulated Depreciation $ 985      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Orlando, FL | One Orlando Centre        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 12,625      
Buildings and Improvements 44,088      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other (2,635)      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 12,625      
Building and Improvements less Cost of Sales, Transfers and Other 41,453      
Total 54,078      
Accumulated Depreciation $ 706      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Orlando, FL | Citrus Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 4,307      
Buildings and Improvements 41,608      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other (71)      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 4,307      
Building and Improvements less Cost of Sales, Transfers and Other 41,537      
Total 45,844      
Accumulated Depreciation $ 797      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Phoenix, AZ | Hayden Ferry        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 13,102      
Buildings and Improvements 262,578      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 2,068      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 13,102      
Building and Improvements less Cost of Sales, Transfers and Other 264,646      
Total 277,748      
Accumulated Depreciation $ 2,620      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
OPERATING PROPERTIES | Phoenix, AZ | Tempe Gateway        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 5,893      
Buildings and Improvements 95,130      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 377      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 5,893      
Building and Improvements less Cost of Sales, Transfers and Other 95,507      
Total 101,400      
Accumulated Depreciation $ 740      
Life on Which Depreciation in 2016 Statement of Operations is Computed 40 years      
PROJECTS UNDER DEVELOPMENT        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land and Improvements 32,261      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 72      
Building and Improvements less Cost of Sales, Transfers and Other 130,054      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 32,333      
Building and Improvements less Cost of Sales, Transfers and Other 130,054      
Total 162,387      
Accumulated Depreciation 0      
PROJECTS UNDER DEVELOPMENT | Atlanta, GA | NCR Phase 1        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 20,032      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 83,962      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 20,032      
Building and Improvements less Cost of Sales, Transfers and Other 83,962      
Total 103,994      
Accumulated Depreciation 0      
PROJECTS UNDER DEVELOPMENT | Atlanta, GA | NCR Phase II        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 8,099      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 8,142      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 8,099      
Building and Improvements less Cost of Sales, Transfers and Other 8,142      
Total 16,241      
Accumulated Depreciation 0      
PROJECTS UNDER DEVELOPMENT | Atlanta, GA | Avalon        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 4,130      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other 72      
Building and Improvements less Cost of Sales, Transfers and Other 37,950      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 4,202      
Building and Improvements less Cost of Sales, Transfers and Other 37,950      
Total 42,152      
Accumulated Depreciation 0      
LAND        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 23,118      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (18,897)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 4,221      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 4,221      
Accumulated Depreciation 0      
Commercial Land        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 21,534      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (17,313)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 4,221      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 4,221      
Accumulated Depreciation 0      
Commercial Land | Suburban Atlanta, GA | Land Adjacent to The Avenue Forsyth        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 11,240      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (7,540)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 3,700      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 3,700      
Accumulated Depreciation 0      
Commercial Land | Suburban Atlanta, GA | North Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 10,294      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (9,773)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 521      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 521      
Accumulated Depreciation 0      
Residential Land        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 1,584      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (1,584)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 0      
Accumulated Depreciation 0      
Residential Land | Pine Mountain, GA | Callaway Gardens        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 1,584      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Land and Improvements less Cost of Sales, Transfers and Other (1,584)      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Gross Amount at Which Carried at Close of Period        
Land and Improvements less Cost of Sales, Transfers and Other 0      
Building and Improvements less Cost of Sales, Transfers and Other 0      
Total 0      
Accumulated Depreciation $ 0