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Consolidated Statements Of Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Cumulative Earnings
Cumulative Distributions to Stockholders
Beginning balance at Dec. 31, 2012 $ 1,140,164 $ 817 $ 1,744,554 $ 138,332 $ 633,052 $ (1,376,591)
Beginning balance (in shares) at Dec. 31, 2012   81,716,416        
Net income 148,112       148,112  
Other comprehensive income (loss) (23,564)     (23,564)    
Issuance of common stock:            
Dividend reinvestment & stock purchase plans (in shares)   374,371        
Dividend reinvestment & stock purchase plans 7,077 4 7,073      
Employee stock purchase and incentive plans (in shares)   297,715        
Employee stock purchase and incentive plans (5,387) 3 (5,390)      
Non-cash equity award compensation 11,443   11,443      
Common dividends declared (70,675)         (70,675)
Ending balance at Sep. 30, 2013 1,207,170 824 1,757,680 114,768 781,164 (1,447,266)
Ending balance (in shares) at Sep. 30, 2013   82,388,502        
Beginning balance at Dec. 31, 2013 1,245,783 825 1,760,899 148,766 806,298 (1,471,005)
Beginning balance (in shares) at Dec. 31, 2013   82,504,801        
Net income 73,447       73,447  
Other comprehensive income (loss) 11,005     11,005    
Issuance of common stock:            
Dividend reinvestment & stock purchase plans (in shares)   336,810        
Dividend reinvestment & stock purchase plans 6,055 4 6,051      
Employee stock purchase and incentive plans (in shares)   442,781        
Employee stock purchase and incentive plans (7,268) 4 (7,272)      
Non-cash equity award compensation 8,934   8,934      
Common dividends declared (71,278)         (71,278)
Ending balance at Sep. 30, 2014 $ 1,266,678 $ 833 $ 1,768,612 $ 159,771 $ 879,745 $ (1,542,283)
Ending balance (in shares) at Sep. 30, 2014   83,284,392