Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 39,427	$ 63,084	$ 106,379	$ 117,944
Income from consolidated joint ventures attributable to noncontrolling interests	(2,053)	(1,982)	(5,358)	(6,643)
Preferred stock dividends and redemption charge	3,207	2,300	12,756	6,900
Dividends paid on unvested restricted stock compensation	(55)	(49)	(173)	(162)
Undistributed income allocated to unvested restricted stock compensation	(123)	(161)	(293)	(270)
Numerator for basic and diluted income attributable to common stockholders	$ 33,989	$ 58,592	$ 87,799	$ 103,969
Denominator:
Weighted average basic and diluted common shares outstanding (in shares)	215,413	207,604	214,565	207,264
Basic and diluted income attributable to common stockholders per common share (in dollars per share)	$ 0.16	$ 0.28	$ 0.41	$ 0.50

Distributed Earnings Loss Allocated To Participating Securities Basic

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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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 aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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