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Consolidated Statements of Stockholders' Equity (unaudited) (Parentheticals) - $ / shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Consolidated Statements of Stockholders' Equity (unaudited)        
Shares issued under the dividend reinvestment plan (in shares) 10,989 6,041 17,264 11,905
Shares issued under the Employee Stock Purchase Plan ("ESPP") (in shares) 5,888   5,888  
Purchase of treasury stock (in shares)   11,400 179,620 11,400
Stock awards granted and distributed (in shares)   3,700 90,657 79,974
Stock awards forfeited (in shares) 5,408 12,317 5,993 12,317
Repurchase of surrendered stock from vesting of stock plans 1,077 1,734 32,302 25,866
Cash dividend declared (in dollars per share) $ 0.24 $ 0.23 $ 0.48 $ 0.46