CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Rental income	$ 154,100	$ 149,562	$ 459,552	$ 430,997
Property other income	12,506	12,171	40,325	38,216
Other income	207	32	671	63
Total revenues	166,813	161,765	500,548	469,276
Expenses:
Operating and maintenance	58,855	57,726	180,298	172,243
General and administrative	6,152	8,018	22,572	27,367
Interest	28,161	31,874	88,048	92,766
Depreciation and amortization	44,005	41,720	129,860	120,234
Other expenses	16	15	48	2,726
Total expenses	137,189	139,353	420,826	415,336
Income from continuing operations	29,624	22,412	79,722	53,940
Discontinued operations:
Income (loss) from discontinued operations		2,010	(377)	5,972
Gain on disposition of property		19,667	45,004	19,667
Discontinued operations		21,677	44,627	25,639
Net income	29,624	44,089	124,349	79,579
Net income attributable to noncontrolling interest	(4,586)	(7,676)	(20,395)	(14,051)
Net income attributable to common stockholders	$ 25,038	$ 36,413	$ 103,954	$ 65,528
Basic earnings per share:
Income from continuing operations (in dollars per share)	$ 0.44	$ 0.37	$ 1.25	$ 0.90
Discontinued operations (in dollars per share)		$ 0.35	$ 0.70	$ 0.43
Net income attributable to common stockholders (in dollars per share)	$ 0.44	$ 0.72	$ 1.95	$ 1.33
Diluted earnings per share:
Income from continuing operations (in dollars per share)	$ 0.44	$ 0.36	$ 1.23	$ 0.89
Discontinued operations (in dollars per share)		$ 0.35	$ 0.69	$ 0.42
Net income attributable to common stockholders (in dollars per share)	$ 0.44	$ 0.71	$ 1.92	$ 1.31
Weighted average number of shares outstanding:
Basic (in shares)	56,370,122	50,255,152	53,444,202	49,218,703
Diluted (in shares)	56,943,806	50,934,153	54,051,510	49,848,429