Notes Payable, Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Notes Payable, Commitments and Contingencies [Abstract]

Summary of terms of notes payable

	September 30,		September 30,		September 30,		September 30,		September 30,
		Term/
		Amortization
Description (see notes below)	Interest Rate	Period (Years)		Maturity		2011		2010
Credit Facility, unsecured	LIBOR + 1.75% to 2.25%		5/N/A		8/29/12	$	198,250	$	105,400
Terminus 100 mortgage note	5.25%		12/30		1/1/23		138,194		140,000
The American Cancer Society Center mortgage note (interest only until October 1, 2011)	6.45%		10/30		9/1/17		135,650		136,000
Meridian Mark Plaza mortgage note	6.00%		10/30		8/1/20		26,554		26,892
100/200 North Point Center East mortgage note	5.39%		5/30		6/1/12		24,478		24,830
The Points at Waterview mortgage note	5.66%		10/25		1/1/16		16,135		16,592
Callaway Gardens	4.13%		N/A		11/18/13		180		173
Mahan Village LLC	3.25%		3/N/A		9/12/14		1		—
333/555 North Point Center East mortgage note	7.00%		10/25		11/1/11		—		26,412
Lakeshore Park Plaza mortgage note	5.89%		4/25		8/1/12		—		17,544
600 University Park Place mortgage note	7.38%		10/30		8/10/11		—		12,292
Handy Road Associates, LLC	Prime + 1%, but not < 6%		5/N/A		3/30/2011		—		3,374
						$	539,442	$	509,509

Fair Values of the interest rate swap agreements

		September 30,			September 30,			September 30,
	Term Facility			Floating Rate, LIBOR-based Borrowings			Total
Balance, December 31, 2009	$	8,662		$	855		$	9,517
Termination of swap		(9,235	)		—			(9,235	)
Change in fair value		573			(855	)		(282	)
Balance, December 31, 2010	$	—		$	—		$	—

Debt Maturities

		September 30,
2012	$	227,050
2013		4,783
2014		4,878
2015		5,168
2016		18,869
Thereafter		278,694
	$	539,442

Summary of interest

		September 30,			September 30,		September 30,
	2011			2010		2009
Total interest incurred	$	28,384		$	37,180	$	45,129
Interest expense — discontinued operations		—			—		(1,634	)
Interest capitalized		(600	)		—		(3,736	)
Total interest expense	$	27,784		$	37,180	$	39,759

Lease Commitments

		September 30,
2012	$	589
2013		274
2014		206
2015		196
2016		146
Thereafter		15,000
	$	16,411