Quarterly report pursuant to Section 13 or 15(d)

Organization (Components Of Changes In Total Equity, Equity Attributable To The Parent And Equity Attributable To Noncontrolling Interests) (Details)

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Organization (Components Of Changes In Total Equity, Equity Attributable To The Parent And Equity Attributable To Noncontrolling Interests) (Details) (USD $)
In Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Organization [Line Items]        
Beginning Balance, Parent     $ 631,581  
Beginning Balance, Noncontrolling Interests     13,082  
Beginning Balance     644,663  
Net income attributable to the parent 2,339 8,923 20,336 32,111
Net income attributable to noncontrolling interest holders     567  
Change in fair value of derivatives net of reclassification to interest expense (866) 112 1,889 (872)
Dividends     (37,366)  
Distributions to noncontrolling interest holders     (567)  
Adjustment of noncontrolling redeemable Operating Partnership units to carrying value     (335)  
Net proceeds from issuance of stock through Stock Option Plan and "at the market" offering     5,679  
Additional paid-in capital related to stock based compensation     1,896  
Additional investment in Locke Sovran II, LLC     (17,000)  
Ending Balance, Parent 619,762   619,762  
Ending Balance 619,762   619,762  
Noncontrolling Interests [Member]
       
Organization [Line Items]        
Beginning Balance, Noncontrolling Interests     13,082  
Net income attributable to noncontrolling interest holders     567  
Distributions to noncontrolling interest holders     (567)  
Additional investment in Locke Sovran II, LLC     (13,082)  
Parent [Member]
       
Organization [Line Items]        
Beginning Balance, Parent     631,581  
Net income attributable to the parent     20,336  
Change in fair value of derivatives net of reclassification to interest expense     1,889  
Dividends     (37,366)  
Adjustment of noncontrolling redeemable Operating Partnership units to carrying value     (335)  
Net proceeds from issuance of stock through Stock Option Plan and "at the market" offering     5,679  
Additional paid-in capital related to stock based compensation     1,896  
Additional investment in Locke Sovran II, LLC     (3,918)  
Ending Balance, Parent $ 619,762   $ 619,762