SUMMARIZED CONDENSED CONSOLIDATING INFORMATION (Condensed Consolidating Balance Sheet) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Assets
Real estate investments, net of accumulated depreciation	$ 698,578	$ 658,377
Loans receivable, net	21,193	0
Cash and cash equivalents	3,110	42,250	3,454	74,233
Restricted cash	7,076	6,093
Deferred tax assets	25,540	25,540
Prepaid expenses, deferred financing costs and other assets	23,021	17,390
Intercompany	0	0
Investments in subsidiaries	0	0
Total assets	778,518	749,650
Liabilities and stockholders’ equity
Mortgage notes payable	157,872	158,398
Secured revolving credit facility	42,500	0
Senior unsecured notes payable	225,000	225,000
Accounts payable and accrued liabilities	11,181	14,139
Tax liability	25,540	25,540
Intercompany	0	0
Total liabilities	462,093	423,077
Stockholders’ equity
Preferred stock	0	0
Common stock	371	369
Additional paid-in capital	349,272	344,995
Cumulative distributions in excess of net income	(33,218)	(18,791)
Total stockholders’ equity	316,425	326,573	175,842	177,533
Total liabilities and stockholders’ equity	778,518	749,650
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	37,051,242	36,891,712
Common stock, shares outstanding	37,051,242	36,891,712
Parent Company [Member]
Assets
Real estate investments, net of accumulated depreciation	162	187
Loans receivable, net	0
Cash and cash equivalents	1,583	41,736	3,326	70,841
Restricted cash	0	0
Deferred tax assets	25,540	25,540
Prepaid expenses, deferred financing costs and other assets	941	874
Intercompany	72,861	0
Investments in subsidiaries	247,171	313,181
Total assets	348,258	381,518
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Accounts payable and accrued liabilities	6,293	6,296
Tax liability	25,540	25,540
Intercompany	0	23,109
Total liabilities	31,833	54,945
Stockholders’ equity
Preferred stock	0	0
Common stock	371	369
Additional paid-in capital	349,272	344,995
Cumulative distributions in excess of net income	(33,218)	(18,791)
Total stockholders’ equity	316,425	326,573
Total liabilities and stockholders’ equity	348,258	381,518
Issuers [Member]
Assets
Real estate investments, net of accumulated depreciation	0	0
Loans receivable, net	0
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Deferred tax assets	0	0
Prepaid expenses, deferred financing costs and other assets	4,706	5,079
Intercompany	135,875	145,018
Investments in subsidiaries	334,637	391,131
Total assets	475,218	541,228
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	225,000	225,000
Accounts payable and accrued liabilities	3,047	3,047
Tax liability	0	0
Intercompany	0	0
Total liabilities	228,047	228,047
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	205,389	288,665
Cumulative distributions in excess of net income	41,782	24,516
Total stockholders’ equity	247,171	313,181
Total liabilities and stockholders’ equity	475,218	541,228
Combined Guarantor Subsidiaries [Member]
Assets
Real estate investments, net of accumulated depreciation	518,588	474,256
Loans receivable, net	21,193
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Deferred tax assets	0	0
Prepaid expenses, deferred financing costs and other assets	13,698	8,544
Intercompany	0	0
Investments in subsidiaries	24,894	23,611
Total assets	578,373	506,411
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	42,500
Senior unsecured notes payable	0	0
Accounts payable and accrued liabilities	1,158	4,107
Tax liability	0	0
Intercompany	238,790	147,146
Total liabilities	282,448	151,253
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	233,433	316,011
Cumulative distributions in excess of net income	62,492	39,147
Total stockholders’ equity	295,925	355,158
Total liabilities and stockholders’ equity	578,373	506,411
Combined Non-Guarantor Subsidiaries [Member]
Assets
Real estate investments, net of accumulated depreciation	179,828	183,934
Loans receivable, net	0
Cash and cash equivalents	1,527	514	128	3,392
Restricted cash	7,076	6,093
Deferred tax assets	0	0
Prepaid expenses, deferred financing costs and other assets	3,676	2,893
Intercompany	30,054	25,237
Investments in subsidiaries	0	0
Total assets	222,161	218,671
Liabilities and stockholders’ equity
Mortgage notes payable	157,872	158,398
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Accounts payable and accrued liabilities	683	689
Tax liability	0	0
Intercompany	0	0
Total liabilities	158,555	159,087
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	52,549	52,110
Cumulative distributions in excess of net income	11,057	7,474
Total stockholders’ equity	63,606	59,584
Total liabilities and stockholders’ equity	222,161	218,671
Elimination [Member]
Assets
Real estate investments, net of accumulated depreciation	0	0
Loans receivable, net	0
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Deferred tax assets	0	0
Prepaid expenses, deferred financing costs and other assets	0	0
Intercompany	(238,790)	(170,255)
Investments in subsidiaries	(606,702)	(727,923)
Total assets	(845,492)	(898,178)
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Accounts payable and accrued liabilities	0	0
Tax liability	0	0
Intercompany	(238,790)	(170,255)
Total liabilities	(238,790)	(170,255)
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	(491,371)	(656,786)
Cumulative distributions in excess of net income	(115,331)	(71,137)
Total stockholders’ equity	(606,702)	(727,923)
Total liabilities and stockholders’ equity	$ (845,492)	$ (898,178)