SUMMARIZED CONDENSED CONSOLIDATING INFORMATION Condensed Consolidating Balance Sheet (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Nov. 15, 2010	Nov. 14, 2010
Assets
Real estate investments, net of accumulated depreciation	$ 827,135	$ 653,377			$ 485,337
Loans receivable, net	12,017	0
Cash and cash equivalents	17,101	42,250	74,233	0	67,134
Restricted cash	4,589	6,093			5,527
Deferred tax assets	24,212	25,540			26,542
Assets held for sale, net	2,215	5,243
Prepaid expenses, deferred financing costs and other assets	29,613	17,147			11,383
Intercompany	0	0
Investments in subsidiaries	0	0
Total assets	916,882	749,650			595,923
Liabilities and stockholders’ equity
Mortgage notes payable	152,322	153,942			151,678
Secured revolving credit facility	92,500	0
Senior unsecured notes payable	330,666	225,000			225,000
Liabilities related to assets held for sale	0	4,485
Accounts payable and accrued liabilities	11,694	14,110			15,754
Tax liability	24,212	25,540			26,300
Intercompany	0	0
Total liabilities	611,394	423,077			418,732
Stockholders’ equity
Preferred stock	0	0			0
Common stock	371	369			251
Additional paid-in capital	353,861	344,995			176,940
Cumulative distributions in excess of net income	(48,744)	(18,791)
Total stockholders' equity	305,488	326,573		177,191	177,191
Total liabilities and stockholders’ equity	916,882	749,650			595,923
Parenthetical Information
Preferred stock, par value	$ 0.01	$ 0.01			$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000			10,000,000
Preferred stock, shares issued	0	0			0
Preferred stock, shares outstanding	0	0			0
Common stock, par value	$ 0.01	$ 0.01			$ 0.01
Common stock, shares authorized	125,000,000	125,000,000			125,000,000
Common stock, shares issued	37,099,202	36,891,712			25,061,072
Common stock, shares outstanding	37,099,202	36,891,712			25,061,072
Parent Company
Assets
Real estate investments, net of accumulated depreciation	151	187
Loans receivable, net	0
Cash and cash equivalents	15,075	41,736	70,841	0
Restricted cash	0	0
Deferred tax assets	24,212	25,540
Assets held for sale, net	0	0
Prepaid expenses, deferred financing costs and other assets	1,315	874
Intercompany	125,596	0
Investments in subsidiaries	166,632	313,181
Total assets	332,981	381,518
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Liabilities related to assets held for sale		0
Accounts payable and accrued liabilities	3,281	6,296
Tax liability	24,212	25,540
Intercompany	0	23,109
Total liabilities	27,493	54,945
Stockholders’ equity
Preferred stock	0	0
Common stock	371	369
Additional paid-in capital	353,861	344,995
Cumulative distributions in excess of net income	(48,744)	(18,791)
Total stockholders' equity	305,488	326,573
Total liabilities and stockholders’ equity	332,981	381,518
Issuers
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
Assets held for sale, net	0	0
Prepaid expenses, deferred financing costs and other assets	7,339	5,079
Intercompany	227,396	145,018
Investments in subsidiaries	266,975	391,131
Total assets	501,710	541,228
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	330,666	225,000
Liabilities related to assets held for sale		0
Accounts payable and accrued liabilities	4,412	3,047
Tax liability	0	0
Intercompany	0	0
Total liabilities	335,078	228,047
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	107,939	288,665
Cumulative distributions in excess of net income	58,693	24,516
Total stockholders' equity	166,632	313,181
Total liabilities and stockholders’ equity	501,710	541,228
Combined Guarantor Subsidiaries
Assets
Real estate investments, net of accumulated depreciation	655,881	474,256
Loans receivable, net	12,017
Cash and cash equivalents	0	0	0	0
Restricted cash	92	0
Deferred tax assets	0	0
Assets held for sale, net	0	0
Prepaid expenses, deferred financing costs and other assets	18,133	8,544
Intercompany	0	0
Investments in subsidiaries	23,142	23,611
Total assets	709,265	506,411
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	92,500
Senior unsecured notes payable	0	0
Liabilities related to assets held for sale		0
Accounts payable and accrued liabilities	3,348	4,107
Tax liability	0	0
Intercompany	390,458	147,146
Total liabilities	486,306	151,253
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	136,666	316,011
Cumulative distributions in excess of net income	86,293	39,147
Total stockholders' equity	222,959	355,158
Total liabilities and stockholders’ equity	709,265	506,411
Combined Non-Guarantor Subsidiaries
Assets
Real estate investments, net of accumulated depreciation	171,103	178,934
Loans receivable, net	0
Cash and cash equivalents	2,026	514	3,392	0
Restricted cash	4,497	6,093
Deferred tax assets	0	0
Assets held for sale, net	2,215	5,243
Prepaid expenses, deferred financing costs and other assets	2,826	2,650
Intercompany	37,466	25,237
Investments in subsidiaries	0	0
Total assets	220,133	218,671
Liabilities and stockholders’ equity
Mortgage notes payable	152,322	153,942
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Liabilities related to assets held for sale		4,485
Accounts payable and accrued liabilities	653	660
Tax liability	0	0
Intercompany	0	0
Total liabilities	152,975	159,087
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	53,952	52,110
Cumulative distributions in excess of net income	13,206	7,474
Total stockholders' equity	67,158	59,584
Total liabilities and stockholders’ equity	220,133	218,671
Elimination
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
Assets held for sale, net	0	0
Prepaid expenses, deferred financing costs and other assets	0	0
Intercompany	(390,458)	(170,255)
Investments in subsidiaries	(456,749)	(727,923)
Total assets	(847,207)	(898,178)
Liabilities and stockholders’ equity
Mortgage notes payable	0	0
Secured revolving credit facility	0
Senior unsecured notes payable	0	0
Liabilities related to assets held for sale		0
Accounts payable and accrued liabilities	0	0
Tax liability	0	0
Intercompany	(390,458)	(170,255)
Total liabilities	(390,458)	(170,255)
Stockholders’ equity
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	(298,557)	(656,786)
Cumulative distributions in excess of net income	(158,192)	(71,137)
Total stockholders' equity	(456,749)	(727,923)
Total liabilities and stockholders’ equity	$ (847,207)	$ (898,178)