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Statements Of Consolidated Stockholders' Equity (Shares) (Parenthetical) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common Stock, Dividends, Per Share, Declared $ 0.780 $ 0.700 $ 0.64
Preferred Stock, Dividends Per Share, Declared $ 28.88 $ 0.00 $ 0.00
Beginning Balance 337,016 323,160 319,110
Treasury stock acquired (166) (293) (433)
Issued:      
Common stock - private placement [1] 24,964    
Employee stock purchase plan 223 207 201
Long-term incentive plan 561 351 2,103
401(k) and profit sharing plan 882 1,396 1,793
Dividend reinvestment plan   264 386
ATM Program 8,883 11,931  
Ending Balance 372,363 337,016 323,160
Common Stock      
Beginning Balance 340,813 326,664 322,181
Issued:      
Common stock - private placement [1] 24,964    
Employee stock purchase plan 223 207 201
Long-term incentive plan 561 351 2,103
401(k) and profit sharing plan 882 1,396 1,793
Dividend reinvestment plan   264 386
ATM Program 8,883 11,931  
Ending Balance 376,326 340,813 326,664
Treasury Stock      
Beginning Balance 3,797 3,504 3,071
Treasury stock acquired (166) (293) (433)
Issued:      
Common stock - private placement [1] 0    
Employee stock purchase plan 0 0 0
Long-term incentive plan 0 0 0
401(k) and profit sharing plan 0 0 0
Dividend reinvestment plan   0 0
ATM Program 0 0  
Ending Balance 3,963 3,797 3,504
Preferred Stock      
Beginning Balance 0 0 0
Issued:      
Common stock - private placement [1] 0    
Preferred [1] 420    
Employee stock purchase plan 0 0 0
Long-term incentive plan 0 0 0
401(k) and profit sharing plan 0 0 0
Dividend reinvestment plan   0 0
ATM Program 0 0  
Ending Balance 420 0 0
[1] See Note 12, "Equity," for additional information.