REAL ESTATE HELD FOR INVESTMENT (Schedule of Real Estate Investments) (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended																				12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2013 Village Overlook Buildings [Member]		Dec. 31, 2013 Academy Point Atrium I [Member]		Dec. 31, 2013 Northridge Center I & II [Member]		Dec. 31, 2013 Iron Point Business Park [Member]		Dec. 31, 2013 1635 N. Cahuenga Building [Member]		Dec. 31, 2013 Powers Ferry Landing East [Member]		Dec. 31, 2013 Bellevue Technology Center [Member]		Dec. 31, 2013 West Loop I & II [Member]		Dec. 31, 2013 Burbank Collection [Member]		Dec. 31, 2013 Richardson Portfolio [Member]		Dec. 31, 2013 Palisades Central I [Member]		Dec. 31, 2013 Palisades Central II [Member]		Dec. 31, 2013 Greenway I [Member]		Dec. 31, 2013 Greenway III [Member]		Dec. 31, 2013 Undeveloped Land [Member]		Dec. 31, 2013 Park Highlands [Member]		Dec. 31, 2013 1800 West Loop [Member]		Dec. 31, 2013 Austin Suburban Portfolio [Member]		Dec. 31, 2013 Westmoor Center [Member]		Dec. 31, 2013 Central Building [Member]		Dec. 31, 2013 50 Congress Street [Member]		Dec. 31, 2013 1180 Raymond [Member]		Dec. 31, 2013 Park Highlands II [Member]		Dec. 31, 2013 Maitland Promenade II [Member]		Dec. 31, 2013 Land [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2013 Land [Member] Village Overlook Buildings [Member]	Dec. 31, 2013 Land [Member] Academy Point Atrium I [Member]	Dec. 31, 2013 Land [Member] Northridge Center I & II [Member]	Dec. 31, 2013 Land [Member] Iron Point Business Park [Member]	Dec. 31, 2013 Land [Member] 1635 N. Cahuenga Building [Member]	Dec. 31, 2013 Land [Member] Powers Ferry Landing East [Member]	Dec. 31, 2013 Land [Member] Bellevue Technology Center [Member]	Dec. 31, 2013 Land [Member] West Loop I & II [Member]	Dec. 31, 2013 Land [Member] Burbank Collection [Member]	Dec. 31, 2013 Land [Member] Richardson Portfolio [Member]	Dec. 31, 2013 Land [Member] Palisades Central I [Member]	Dec. 31, 2013 Land [Member] Palisades Central II [Member]	Dec. 31, 2013 Land [Member] Greenway I [Member]	Dec. 31, 2013 Land [Member] Greenway III [Member]	Dec. 31, 2013 Land [Member] Undeveloped Land [Member]	Dec. 31, 2013 Land [Member] Park Highlands [Member]	Dec. 31, 2013 Land [Member] 1800 West Loop [Member]	Dec. 31, 2013 Land [Member] Austin Suburban Portfolio [Member]	Dec. 31, 2013 Land [Member] Westmoor Center [Member]	Dec. 31, 2013 Land [Member] Central Building [Member]	Dec. 31, 2013 Land [Member] 50 Congress Street [Member]	Dec. 31, 2013 Land [Member] 1180 Raymond [Member]	Dec. 31, 2013 Land [Member] Park Highlands II [Member]	Dec. 31, 2013 Land [Member] Maitland Promenade II [Member]	Dec. 31, 2013 Buildings and Improvements [Member]	Dec. 31, 2012 Buildings and Improvements [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Village Overlook Buildings [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Academy Point Atrium I [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Northridge Center I & II [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Iron Point Business Park [Member]	Dec. 31, 2013 Buildings and Improvements [Member] 1635 N. Cahuenga Building [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Powers Ferry Landing East [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Bellevue Technology Center [Member]	Dec. 31, 2013 Buildings and Improvements [Member] West Loop I & II [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Burbank Collection [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Richardson Portfolio [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Palisades Central I [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Palisades Central II [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Greenway I [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Greenway III [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Undeveloped Land [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Park Highlands [Member]	Dec. 31, 2013 Buildings and Improvements [Member] 1800 West Loop [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Austin Suburban Portfolio [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Westmoor Center [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Central Building [Member]	Dec. 31, 2013 Buildings and Improvements [Member] 50 Congress Street [Member]	Dec. 31, 2013 Buildings and Improvements [Member] 1180 Raymond [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Park Highlands II [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Maitland Promenade II [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member]	Dec. 31, 2012 Tenant Origination and Absorption Costs [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Village Overlook Buildings [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Academy Point Atrium I [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Northridge Center I & II [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Iron Point Business Park [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] 1635 N. Cahuenga Building [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Powers Ferry Landing East [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Bellevue Technology Center [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] West Loop I & II [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Burbank Collection [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Richardson Portfolio [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Palisades Central I [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Palisades Central II [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Greenway I [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Greenway III [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Undeveloped Land [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Park Highlands [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] 1800 West Loop [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Austin Suburban Portfolio [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Westmoor Center [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Central Building [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] 50 Congress Street [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] 1180 Raymond [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Park Highlands II [Member]	Dec. 31, 2013 Tenant Origination and Absorption Costs [Member] Maitland Promenade II [Member]
Real Estate Properties [Line Items]
Date acquired or foreclosed on				Aug. 02, 2010		Nov. 03, 2010		Mar. 25, 2011		Jun. 21, 2011		Aug. 03, 2011		Sep. 24, 2012		Jul. 31, 2012		Dec. 07, 2012		Dec. 12, 2012				Nov. 23, 2011		Nov. 23, 2011		Nov. 23, 2011		Nov. 23, 2011		Nov. 23, 2011		Dec. 30, 2011		Dec. 04, 2012		Mar. 28, 2013		Jun. 12, 2013		Jul. 10, 2013		Jul. 11, 2013		Aug. 20, 2013		Dec. 10, 2013		Dec. 18, 2013
Total real estate, cost	$ 668,018	[1]	$ 307,646	$ 1,274	[1]	$ 3,300	[1]	$ 7,988	[1]	$ 21,513	[1]	$ 7,768	[1]	$ 7,135	[1]	$ 79,378	[1]	$ 38,796	[1]	$ 13,016	[1]	$ 45,471	[1]	$ 11,454	[1]	$ 19,145	[1]	$ 2,741	[1]	$ 5,470	[1]	$ 6,661	[1]	$ 26,287	[1]	$ 70,237	[1]	$ 77,687	[1]	$ 83,741	[1]	$ 33,227	[1]	$ 53,531	[1]	$ 46,668	[1]	$ 20,285	[1]	$ 30,716	[1]	$ 159,918	$ 88,794	$ 322	$ 1,291	$ 2,234	$ 2,670	$ 3,112	$ 1,642	$ 25,506	$ 7,300	$ 4,175	$ 9,771	$ 1,037	$ 810	$ 561	$ 702	$ 6,661	$ 26,287	$ 8,360	$ 8,288	$ 10,058	$ 7,015	$ 9,876	$ 8,292	$ 20,285	$ 3,434	$ 460,088	$ 197,443	$ 952	$ 2,009	$ 5,754	$ 18,652	$ 4,508	$ 5,289	$ 50,059	$ 27,903	$ 7,765	$ 31,511	$ 9,099	$ 16,408	$ 2,180	$ 3,824	$ 0	$ 0	$ 56,168	$ 64,178	$ 63,566	$ 23,848	$ 39,813	$ 35,643	$ 0	$ 22,470	$ 48,012	$ 21,409	$ 0	$ 0	$ 0	$ 191	$ 148	$ 204	$ 3,813	$ 3,593	$ 1,076	$ 4,189	$ 1,318	$ 1,927	$ 0	$ 944	$ 0	$ 0	$ 5,709	$ 5,221	$ 10,117	$ 2,364	$ 3,842	$ 2,733	$ 0	$ 4,812
Accumulated depreciation and amortization	(29,859)		(7,615)	0		0		(626)		(1,821)		(493)		(298)		(3,188)		(2,697)		(490)		(5,626)		(1,551)		(2,902)		(208)		(965)		0		0		(3,678)		(3,627)		(3,231)		(742)		(1,543)		(1,716)		0		(83)
Total real estate, net	$ 638,159		$ 300,031	$ 1,274		$ 3,300		$ 7,362		$ 19,692		$ 7,275		$ 6,837		$ 76,190		$ 36,099		$ 12,526		$ 39,845		$ 9,903		$ 16,243		$ 2,533		$ 4,505		$ 6,661		$ 26,287		$ 66,559		$ 74,060		$ 80,510		$ 32,485		$ 51,988		$ 44,952		$ 20,285		$ 30,633
Ownership %				100.00%		100.00%		100.00%		100.00%		70.00%		100.00%		100.00%		100.00%		90.00%				90.00%		90.00%		90.00%		90.00%		90.00%		50.10%		100.00%		100.00%		100.00%		100.00%		100.00%		100.00%		99.50%		100.00%

[1] Amounts are net of impairment charges. See “—Impairment of Real Estate” below.