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Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues    
Total revenues $ 550,960 $ 637,862
Expenses    
Total expenses 482,109 568,356
Operating income (loss)    
Total operating income 68,851 69,506
Interest expense, net—other than on deposit liabilities and other bank borrowings (20,126) (19,100)
Allowance for borrowed funds used during construction 662 499
Allowance for equity funds used during construction 1,739 1,413
Income before income taxes 51,126 52,318
Income taxes 18,301 19,979
Net income 32,825 32,339
Preferred stock dividends of subsidiaries 473 473
Net income for common stock $ 32,352 $ 31,866
Basic earnings per common share (in dollars per share) $ 0.30 $ 0.31
Diluted earnings per common share (in dollars per share) 0.30 0.31
Dividends per common share (in dollars per share) $ 0.31 $ 0.31
Weighted-average number of common shares outstanding (in shares) 107,620 103,281
Net effect of potentially dilutive shares (in shares) 161 286
Adjusted weighted-average shares (in shares) 107,781 103,567
Electric utility    
Revenues    
Total revenues $ 482,052 $ 573,442
Expenses    
Total expenses 426,726 515,806
Operating income (loss)    
Total operating income 55,326 57,636
Income before income taxes 40,419 43,223
Income taxes 14,553 15,850
Net income 25,866 27,373
Preferred stock dividends of subsidiaries 499 499
Net income for common stock 25,367 26,874
Bank    
Revenues    
Total revenues 68,840 64,348
Expenses    
Total expenses 49,246 43,717
Operating income (loss)    
Total operating income 19,594 20,631
Income before income taxes 19,594 20,631
Income taxes 6,921 7,156
Net income 12,673 13,475
Net income for common stock 12,673 13,475
Other    
Revenues    
Total revenues 68 72
Expenses    
Total expenses 6,137 8,833
Operating income (loss)    
Total operating income (6,069) (8,761)
Income before income taxes (8,887) (11,536)
Income taxes (3,173) (3,027)
Net income (5,714) (8,509)
Preferred stock dividends of subsidiaries (26) (26)
Net income for common stock $ (5,688) $ (8,483)