Equity - Shares and Units and Dividends (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Class of Stock [Line Items]
Net income attributable to common stockholders	$ 3,138,000	$ 4,369,000
Change from net income attributable to common stockholders and transfers from noncontrolling interests	22,631,000
Shares and Units [Abstract]
OP units outstanding (shares)	267,555,807
OP units owned by the Company (shares)	111,747,341
OP units owned by the Company, percent	41.80%
OP units not owned by the Company (shares)	155,808,466
OP units not owned by the Company, percent	58.20%
Dividends and Distributions [Abstract]
Dividends paid to common shareholders	9,400,000us-gaap_PaymentsOfDividendsCommonStock	8,100,000us-gaap_PaymentsOfDividendsCommonStock
Distributions paid to OP unitholders	13,300,000	12,800,000
Private perpetual preferred unit distributions	234,000	0
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Increase in additional paid-in capital for the conversion of OP units into common stock	$ 19,493,000

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Payments of Private Perpetual Preferred Units Distributions

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The number of general partner units outstanding.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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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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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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The number of units or equivalent units outstanding for all classes.

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