Equity - Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income	$ 7,888us-gaap_ProfitLoss	$ 11,231us-gaap_ProfitLoss
Private perpetual preferred unit distributions	(234)	0
Net income attributable to non-controlling interests	(4,516)	(6,862)
Earnings allocated to unvested shares	(7)	(10)
Net income attributable to common stockholders - basic	3,131	4,359
Earnings allocated to unvested shares and LTIP units	(144)	(122)
Net income attributable to common stockholders - diluted	$ 7,510	$ 11,109
Denominator:
Weighted average shares outstanding - basic	109,400,000	95,466,000
Operating partnership units	156,410,000	148,959,000
Weighted average shares outstanding - diluted	265,810,000	244,425,000
Basic (USD per share)	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic
Diluted (USD pre share)	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	630,843	505,138

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Net Income (Loss), Excluding Portion Attributable to Noncontrolling Interest and Participating Securities, Basic

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Net Income (Loss), Excluding Portion Attributable to Noncontrolling Interest and Participating Securities, Diluted

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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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