Segment Reporting (Summary Of Segment Results) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Rental income from operating leases	$ 11,074	$ 8,929
Advisory services income - related party	843	1,131
Total revenue	11,917	10,060
General and administrative	1,951	1,484
Property expense	3,119	2,213
Legal and professional	252	221
Real estate commissions	52	86
Depreciation and amortization	3,299	2,227
Total expenses	8,673	6,231
Interest expense	(2,493)	(2,634)
Other income/(expense)	7,645	62
Net income (loss)	8,396	1,257
Portfolio [Member]
Segment Reporting Information [Line Items]
Rental income from operating leases	11,036	8,885
Total revenue	11,036	8,885
General and administrative	755	407
Property expense	3,119	2,213
Legal and professional	242	198
Real estate commissions	1
Depreciation and amortization	3,293	2,221
Total expenses	7,410	5,039
Interest expense	(2,493)	(2,634)
Other income/(expense)	7,793	97
Net income (loss)	8,926	1,309
Advisory Services [Member] | Real Estate Operating And Development [Member]
Segment Reporting Information [Line Items]
Rental income from operating leases	38	44
Advisory services income - related party	688	976
Total revenue	726	1,020
General and administrative	1,170	1,049
Legal and professional	10	23
Real estate commissions	51	86
Depreciation and amortization	6	6
Total expenses	1,237	1,164
Other income/(expense)		1
Net income (loss)	(511)	(143)
Advisory Services [Member] | Advised Funds [Member]
Segment Reporting Information [Line Items]
Advisory services income - related party	155	155
Total revenue	155	155
General and administrative	26	28
Total expenses	26	28
Other income/(expense)	(148)	(36)
Net income (loss)	$ (19)	$ 91