CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Rental income	$ 127,669	$ 112,297	$ 239,724	$ 224,150
Residents fees and services	79,039	74,631	158,481	149,687
Total revenues	206,708	186,928	398,205	373,837
Expenses:
Property operating expenses	79,786	74,484	157,590	148,163
Depreciation	46,703	38,296	85,058	75,999
General and administrative	9,577	8,168	17,866	16,816
Acquisition related costs	2,512	292	2,635	2,187
Impairment of assets		4,371		5,675
Total expenses	138,578	125,611	263,149	248,840
Operating income	68,130	61,317	135,056	124,997
Interest and other income	154	397	258	570
Interest expense	(34,112)	(29,567)	(63,012)	(59,131)
Loss on early extinguishment of debt		(105)		(105)
Income from continuing operations before income tax expense and equity in earnings of an investee	34,172	32,042	72,302	66,331
Income tax expense	(155)	(140)	(346)	(280)
Equity in earnings of an investee	118	79	21	155
Income from continuing operations	34,135	31,981	71,977	66,206
Discontinued operations:
Income from discontinued operations	741	1,513	2,041	2,523
Impairment of assets from discontinued operations	387	(27,896)	(334)	(27,896)
Income before gain on sale of properties	35,263	5,598	73,684	40,833
Gain on sale of properties	2,396		2,552
Net income	37,659	5,598	76,236	40,833
Other comprehensive income:
Change in net unrealized (loss) / gain on investments	640	(4,404)	(1,280)	4,360
Share of comprehensive income (loss) of an investee	31	(73)	50	(81)
Comprehensive income	$ 38,330	$ 1,121	$ 75,006	$ 45,112
Weighted average shares outstanding (in shares)	199,810	188,081	194,025	186,350
Income from continuing operations per share (in dollars per share)	$ 0.18	$ 0.17	$ 0.38	$ 0.36
Income from discontinued operations per share (in dollars per share)	$ 0.01	$ (0.14)	$ 0.01	$ (0.14)
Net income per share (in dollars per share)	$ 0.19	$ 0.03	$ 0.39	$ 0.22

Represents the increase (decrease) in the entity's share of other comprehensive income of the investee.

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The aggregate revenue from residents fees and related services provided during the reporting period.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Total costs of sales and operating expenses for the period.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Amount after tax of loss recognized for the write-down to fair value, less cost to sell, of a disposal group. Includes after tax gain for a subsequent increase in fair value (less cost to sell) up to the cumulative loss previously recognized through write-downs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Income or Loss from continuing operations, net of taxes, including net Income or Loss from discontinued operations but before extraordinary items.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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Amount of the cost of borrowed funds accounted for as interest expense.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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The aggregate revenue from real estate operations during the reporting period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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