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Acquisitions And Development (Pro Forma Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Acquisitions And Development [Abstract]
Pro forma total revenues	$ 613,013	$ 583,708
Pro forma net income attributable to common stockholders	$ 41,112	$ 25,285
Pro forma earnings per common share, Basic	$ 0.98	$ 0.69
Pro forma earnings per common share, Diluted	$ 0.97	$ 0.68

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details