Notes Payable (Terms of Notes Payable) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes Payable, Gross	$ 1,241,571	$ 1,378,676
Unamortized premium, net	3,601	6,792
Unamortized loan costs	(4,444)	(4,548)
Notes Payable	1,240,728	1,380,920
Notes Payable - real estate assets held for sale, net	(126,962)	0
Total Notes Payable	$ 1,113,766	1,380,920
Credit Facility, unsecured
Debt Instrument [Line Items]
Interest Rate (percent)	2.08%
Notes Payable, Gross	$ 0	134,000
Term Loan, unsecured
Debt Instrument [Line Items]
Interest Rate (percent)	2.18%
Notes Payable, Gross	$ 250,000	250,000
Mortgage Debt \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate (percent)	3.37%
Notes Payable, Gross	$ 148,786	149,516
Mortgage Debt \| One Eleven Congress
Debt Instrument [Line Items]
Interest Rate (percent)	6.08%
Notes Payable, Gross	$ 128,000	128,000
Mortgage Debt \| The ACS Center
Debt Instrument [Line Items]
Interest Rate (percent)	6.45%
Notes Payable, Gross	$ 126,997	127,508
Mortgage Debt \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate (percent)	3.45%
Notes Payable, Gross	$ 120,000	120,000
Mortgage Debt \| Promenade
Debt Instrument [Line Items]
Interest Rate (percent)	4.27%
Notes Payable, Gross	$ 104,607	105,342
Mortgage Debt \| San Jacinto Center
Debt Instrument [Line Items]
Interest Rate (percent)	6.048%
Notes Payable, Gross	$ 101,000	101,000
Mortgage Debt \| 816 Congress
Debt Instrument [Line Items]
Interest Rate (percent)	3.75%
Notes Payable, Gross	$ 84,486	84,872
Mortgage Debt \| 3344 Peachtree
Debt Instrument [Line Items]
Interest Rate (percent)	4.75%
Notes Payable, Gross	$ 78,453	78,971
Mortgage Debt \| Two Buckhead Plaza
Debt Instrument [Line Items]
Interest Rate (percent)	6.43%
Notes Payable, Gross	$ 52,000	52,000
Mortgage Debt \| Meridian Mark Plaza
Debt Instrument [Line Items]
Interest Rate (percent)	6.00%
Notes Payable, Gross	$ 24,404	24,522
Mortgage Debt \| The Pointe
Debt Instrument [Line Items]
Interest Rate (percent)	4.01%
Notes Payable, Gross	$ 22,838	$ 22,945

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