Summary Of Significant Accounting Policies (Summary Of Elements Used In Calculating Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Accounting Policies [Abstract]
Net income (loss) attributable to common stockholders	$ 6,527	$ (5,016)		$ 11,913	$ (5,365)
Add back: Net income (loss) attributable to noncontrolling interests in our Operating Partnership	1,431	0		2,641	0
Numerator for diluted net income (loss) attributable to all equity holders	$ 7,958	$ (5,016)		$ 14,554	$ (5,365)
Weighted average shares of common stock outstanding - basic	139,651	124,610		139,025	124,411
Operating partnership units	30,548	0	[1]	30,825	0	[1]
Stock options	2,392	0	[1]	2,106	0	[1]
Unvested long term incentive plan (LTIP) units	602	0	[1]	525	0	[1]
Weighted average shares of common stock and common stock equivalents outstanding - diluted	173,193	124,610		172,481	124,411
Net income (loss) attributable to common stockholders per share, Basic earnings per share	$ 0.05	$ (0.04)		$ 0.09	$ (0.04)
Net income (loss) attributable to common stockholders per share, Fully diluted earnings per share	$ 0.05	$ (0.04)		$ 0.08	$ (0.04)

[1] Diluted shares represent ownership in our company through shares of common stock, units in our operating partnership and other convertible equity instruments. Basic and diluted shares are calculated in accordance with GAAP, and include common stock plus dilutive equity instruments, as appropriate. For the three and six months ended June 30, 2011, all potentially dilutive instruments, including OP units, stock options, and LTIP units have been excluded from the computation of weighted average dilutive shares outstanding because they were not dilutive.