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Notes Payable (Debt Table) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Summary of terms of notes payable |  |
Notes payable | $ 642,834 | $ 425,410
Post Oak Central Mortgage Note [Member] |  |
Summary of terms of notes payable |  |
Notes payable | 188,830 | 0
The American Cancer Society Center mortgage note [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 6.45% |
Notes payable | 133,112 | 134,243
Promenade Atlanta Mortgage Note [Member] |  |
Summary of terms of notes payable |  |
Notes payable | 114,000 | 0
191 Peachtree Tower Mortgage Note [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 3.35% |
Notes payable | 100,000 | 100,000
Credit Facility, unsecured Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 1.70% |
Notes payable | 51,075 | 0
Meridian Mark Plaza mortgage note [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 6.00% |
Notes payable | 25,910 | 26,194
Points at Waterview mortgage note [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 5.66% |
Notes payable | 15,270 | 15,651
Mahan Village LLC [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 1.85% |
Notes payable | 14,463 | 13,027
Callaway Gardens [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 4.13% |
Notes payable | 174 | 172
Terminus 100 mortgage note [Member] |  |
Summary of terms of notes payable |  |
Interest rate on mortgage loan | 5.25% |
Notes payable | $ 0 | $ 136,123

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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