Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES
Rental income																	$ 318,294	$ 288,787	$ 263,740
Mortgage interest																	12,701	9,186	6,973
Other operating																	5,931	6,101	7,885
Total Revenue	90,116	[1]	84,311	[2]	82,062	[3]	80,437	[4]	78,250	[5]	76,481	[6]	75,487	[7]	73,856	[8]	336,926	304,074	278,598
EXPENSES
Property operating																	125,565	116,470	112,152
General and administrative																	23,729	20,905	20,988
Depreciation																	88,380	81,966	72,036
Amortization																	10,645	10,418	8,105
Bad debt, net of recoveries																	184	241	(251)
Total Expenses																	248,503	230,000	213,030
OTHER INCOME (EXPENSE)
Loss on extinguishment of debt					(29,900)												(29,638)		(1,986)
Interest expense																	(73,511)	(74,955)	(75,938)
Gain on sale of cost method investment in real estate																	1,492	0	0
Interest and other income, net																	966	976	813
Total other income (expense)																	(100,691)	(73,979)	(77,111)
INCOME (LOSS) FROM CONTINUING OPERATIONS	9,888	[1]	4,703	[2]	(27,701)	[3]	842	[4]	(1,467)	[5]	635	[6]	875	[7]	52	[8]	(12,268)	95	(11,543)
DISCONTINUED OPERATIONS
Income from discontinued operations																	4,422	9,474	11,021
Impairments																	(9,889)	(14,908)	(6,697)
Gain on sales of real estate properties	2,700		20,200		1,800				1,200		6,300				3,400		24,718	10,874	7,035
INCOME FROM DISCONTINUED OPERATIONS	2,568	[1]	15,080	[2]	3,463	[3]	(1,860)	[4]	(4,895)	[5]	5,200	[6]	2,053	[7]	3,082	[8]	19,251	5,440	11,359
NET INCOME (LOSS)	12,456	[1]	19,783	[2]	(24,238)	[3]	(1,018)	[4]	(6,362)	[5]	5,835	[6]	2,928	[7]	3,134	[8]	6,983	5,535	(184)
Less: Net income attributable to noncontrolling interests	(72)	[1]	(17)	[2]	33	[3]	19	[4]	(29)	[5]	(21)	[6]	(20)	[7]	0	[8]	(37)	(70)	(30)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 12,384	[1]	$ 19,766	[2]	$ (24,205)	[3]	$ (999)	[4]	$ (6,391)	[5]	$ 5,814	[6]	$ 2,908	[7]	$ 3,134	[8]	$ 6,946	$ 5,465	$ (214)
BASIC EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)																	$ (0.13)	$ 0.00	$ (0.16)
Discontinued operations (in dollars per share)																	$ 0.21	$ 0.07	$ 0.16
Net income (loss) attributable to common stockholders (in dollars per share)	$ 0.13	[1]	$ 0.21	[2]	$ (0.27)	[3]	$ (0.01)	[4]	$ (0.07)	[5]	$ 0.08	[6]	$ 0.04	[7]	$ 0.04	[8]	$ 0.08	$ 0.07	$ 0.00
DILUTED EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)																	$ (0.13)		$ (0.16)
Discontinued operations (in dollars per share)																	$ 0.21	$ 0.07	$ 0.16
Net income (loss) attributable to common stockholders (in dollars per share)	$ 0.13	[1]	$ 0.21	[2]	$ (0.27)	[3]	$ (0.01)	[4]	$ (0.07)	[5]	$ 0.07	[6]	$ 0.04	[7]	$ 0.04	[8]	$ 0.08	$ 0.07	$ 0.00
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares)																	90,940,627	78,844,840	72,720,147
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares)																	90,940,627	80,127,883	72,720,147

[1] The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.

[2] The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.

[3] The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.

[4] The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.

[5] The decreases in net income and amounts per share for the fourth quarter of 2012 are primarily attributable to impairment charges of $7.7 million. This amount is partially offset by gains on sales of real estate totaling $1.2 million.

[6] The increases in net income and amounts per share for the third quarter of 2012 are primarily attributable to gains on sales of real estate totaling $6.3 million, partially offset by impairment charges of $2.9 million.

[7] The decreases in net income and amounts per share for the second quarter of 2012 are primarily attributable to impairment charges of $0.2 million.

[8] The increases in net income and amounts per share for the first quarter of 2012 are primarily attributable to gains on sales of real estate totaling $3.4 million and a lease termination fee totaling $1.5 million which is included in discontinued operations. This amount is partially offset by impairment charges of $4.2 million.