Investment in Unconsolidated Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
SUMMARY OF FINANCIAL POSITION:
Total Assets	$ 661,305			$ 657,384
Total Debt	419,251			428,153
Total Equity	217,193			210,460
Company's Investment	88,111			84,322
SUMMARY OF OPERATIONS:
Total Revenues	52,046		77,469
Net Income (Loss)	9,009		12,879
Income (Loss) from Equity Method Investments Gross of Impairment Charges	3,313		2,784
Terminus Office Holdings [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	294,372			297,815
Total Debt	214,806			215,942
Total Equity	65,665			69,867
Company's Investment	33,750			35,885
SUMMARY OF OPERATIONS:
Total Revenues	19,357		14,616
Net Income (Loss)	(2)		29
Income (Loss) from Equity Method Investments Gross of Impairment Charges	(23)		14
EP I LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	87,330			88,130
Total Debt	57,912			57,092
Total Equity	27,486			29,229
Company's Investment	24,012			25,319
SUMMARY OF OPERATIONS:
Total Revenues	5,975		2,988
Net Income (Loss)	1,417		(695)
Income (Loss) from Equity Method Investments Gross of Impairment Charges	1,062		(521)
Cousins Watkins LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	50,497			51,653
Total Debt	27,428			27,710
Total Equity	22,057			23,081
Company's Investment	17,502			17,213
SUMMARY OF OPERATIONS:
Total Revenues	2,526		2,595
Net Income (Loss)	159		46
Income (Loss) from Equity Method Investments Gross of Impairment Charges	1,133		1,159
Charlotte Gateway Village, LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	134,303			135,966
Total Debt	44,104			52,408
Total Equity	87,457			82,373
Company's Investment	11,235			11,252
SUMMARY OF OPERATIONS:
Total Revenues	16,732		16,815
Net Income (Loss)	5,689		5,224
Income (Loss) from Equity Method Investments Gross of Impairment Charges	588		588
EP II LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	24,281			12,644
Total Debt	1			1
Total Equity	21,329			11,695
Company's Investment	16,947			9,566
Temco Associates, LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	8,467			8,474
Total Debt	0			0
Total Equity	8,229			8,315
Company's Investment	3,949			4,083
SUMMARY OF OPERATIONS:
Total Revenues	714		206
Net Income (Loss)	114		18
Income (Loss) from Equity Method Investments Gross of Impairment Charges	(34)		(15)
CL Realty, L.L.C. [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	7,652			7,602
Total Debt	0			0
Total Equity	7,524			7,374
Company's Investment	3,768			3,704
SUMMARY OF OPERATIONS:
Total Revenues	827		373
Net Income (Loss)	550		216
Income (Loss) from Equity Method Investments Gross of Impairment Charges	264		206
Wildwood Associates
SUMMARY OF FINANCIAL POSITION:
Total Assets	21,111			21,127
Total Debt	0			0
Total Equity	21,036			21,121
Company's Investment	(1,720)	[1]		(1,689)	[1]
SUMMARY OF OPERATIONS:
Total Revenues	29		0
Net Income (Loss)	(86)		(84)
Income (Loss) from Equity Method Investments Gross of Impairment Charges	(30)		(42)
Crawford Long CPI LLC [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	31,841			32,042
Total Debt	75,000			75,000
Total Equity	(44,860)			(44,295)
Company's Investment	(21,333)	[1]		(21,071)	[1]
SUMMARY OF OPERATIONS:
Total Revenues	5,881		5,873
Net Income (Loss)	1,348		1,382
Income (Loss) from Equity Method Investments Gross of Impairment Charges	701		686
CF Murfreesboro Associates [Member]
SUMMARY OF OPERATIONS:
Total Revenues	0		6,576
Net Income (Loss)	0		(507)
Income (Loss) from Equity Method Investments Gross of Impairment Charges	(390)		(379)
Cp Venture Five LLC [Member]
SUMMARY OF OPERATIONS:
Total Revenues	0		15,140
Net Income (Loss)	0		2,193
Income (Loss) from Equity Method Investments Gross of Impairment Charges	0		558
CP Venture Two LLC [Member]
SUMMARY OF OPERATIONS:
Total Revenues	0		9,741
Net Income (Loss)	0		5,386
Income (Loss) from Equity Method Investments Gross of Impairment Charges	0		556
MSREF Terminus Two Hundred LLC [Member]
SUMMARY OF OPERATIONS:
Total Revenues	0		1,278
Net Income (Loss)	0		(161)
Income (Loss) from Equity Method Investments Gross of Impairment Charges	0		(28)
Other Equity Method Investee [Member]
SUMMARY OF FINANCIAL POSITION:
Total Assets	1,451			1,931
Total Debt	0			0
Total Equity	1,270			1,700
Company's Investment	1			60
SUMMARY OF OPERATIONS:
Total Revenues	5		1,268
Net Income (Loss)	(180)		(168)
Income (Loss) from Equity Method Investments Gross of Impairment Charges	$ 42		$ 2

[1] Negative balances are included in deferred income on the balance sheets.