Earnings Per Share , Calculation of Numerator and Denominator (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Numerator
Basic earnings: net income attributable to common stockholders	$ 5,377	$ 2,400
Add: amounts attributable to noncontrolling interest	0	185
Diluted earnings: net income available to common stockholders and unitholders	$ 5,377	$ 2,585
Denominator
Weighted average common shares outstanding	25,310	20,661
Weighted average unvested restricted stock outstanding	277	147
Basic Weighted average common shares outstanding	25,587	20,808
Add: dilutive securities	18	2,094
Diluted weighted average common shares	25,605	22,902
Basic	$ 0.21	$ 0.12
Diluted	$ 0.21	$ 0.11

Basic weighted average common shares less unvested restricted stock outstanding

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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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The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

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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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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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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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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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