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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: 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)
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Notes Payable (Debt Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2015
Debt Instrument [Line Items]
Document Fiscal Year Focus	2015	2014	2013
Notes Payable	$ 721,293	$ 792,344
Post Oak Central mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	4.26%
Notes Payable	$ 181,770	185,109
Credit Facility, unsecured
Debt Instrument [Line Items]
Interest Rate (percent)	1.53%
Notes Payable	$ 92,000	140,200
The American Cancer Society Center mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	6.45%
Notes Payable	$ 129,342	131,083
Promenade mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	4.27%
Notes Payable	$ 108,203	110,946
191 Peachtree Tower mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	3.35%
Notes Payable	$ 100,000	100,000
816 Congress mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	3.75%
Notes Payable	$ 85,000	85,000
Meridian Mark Plaza mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	6.00%
Notes Payable	$ 24,978	25,408
The Points at Waterview mortgage note
Debt Instrument [Line Items]
Interest Rate (percent)	5.66%
Notes Payable	$ 0	$ 14,598		$ 14,200