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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
Mar. 31, 2013
Mar. 31, 2012
Accounting Policies [Abstract]    
Net income attributable to common stockholders $ 12,082 $ 5,386
Add back: Net income attributable to noncontrolling interests in our Operating Partnership 2,416 1,210
Numerator for diluted net income attributable to all equity holders $ 14,498 $ 6,596
Weighted average shares of common stock outstanding - basic 142,440 138,399
Operating partnership units and vested long term incentive plan (LTIP) units 28,483 [1] 31,101 [1]
Stock options 3,148 [1] 1,861 [1]
Unvested LTIP units 508 [1] 455 [1]
Weighted average shares of common stock and common stock equivalents outstanding - diluted 174,579 171,816
Net income attributable to common stockholders per share $ 0.08 $ 0.04
Net income attributable to common stockholders per share $ 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.