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Consolidated Statements Of Changes In 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 126,183       126,183  
Other comprehensive income (20,049)     (20,049)    
Issuance of common stock:            
Dividend reinvestment & stock purchase plans (in shares)   321,120        
Dividend reinvestment & stock purchase plans 6,046 3 6,043      
Employee stock purchase and incentive plans (in shares)   294,200        
Employee stock purchase and incentive plans (5,451) 3 (5,454)      
Non-cash equity award compensation 9,515   9,515      
Common dividends declared (47,095)         (47,095)
Ending balance at Jun. 30, 2013 1,209,313 823 1,754,658 118,283 759,235 (1,423,686)
Ending balance (in shares) at Jun. 30, 2013   82,331,736        
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 28,350       28,350  
Other comprehensive income 18,791     18,791    
Issuance of common stock:            
Dividend reinvestment & stock purchase plans (in shares)   179,187        
Dividend reinvestment & stock purchase plans 3,475 2 3,473      
Employee stock purchase and incentive plans (in shares)   396,130        
Employee stock purchase and incentive plans (6,663) 4 (6,667)      
Non-cash equity award compensation 6,681   6,681      
Common dividends declared (47,513)         (47,513)
Ending balance at Jun. 30, 2014 $ 1,248,904 $ 831 $ 1,764,386 $ 167,557 $ 834,648 $ (1,518,518)
Ending balance (in shares) at Jun. 30, 2014   83,080,118