Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2015	Mar. 31, 2014
Revenues
Total revenues		$ 637,862	$ 783,749
Expenses
Total expenses		568,356	694,535
Operating income (loss)
Total operating income		69,506	89,214
Interest expense, net—other than on deposit liabilities and other bank borrowings		(19,100)	(19,456)
Allowance for borrowed funds used during construction		499	614
Allowance for equity funds used during construction	[1]	1,413	1,609
Income before income taxes		52,318	71,981
Income taxes		19,979	25,721
Net income	[1]	32,339	46,260
Preferred stock dividends of subsidiaries		473	473
Net income for common stock		$ 31,866	$ 45,787
Basic earnings per common share (in dollars per share)		$ 0.31	$ 0.45
Diluted earnings per common share (in dollars per share)		0.31	0.45
Dividends per common share (in dollars per share)		$ 0.31	$ 0.31
Weighted-average number of common shares outstanding (in shares)		103,281	101,382
Net effect of potentially dilutive shares (in shares)		286	783
Adjusted weighted-average shares (in shares)		103,567	102,165
Electric utility
Revenues
Total revenues		$ 573,442	$ 720,062
Expenses
Total expenses		515,806	649,396
Operating income (loss)
Total operating income		57,636	70,666
Income before income taxes		43,223	57,166
Income taxes		15,850	21,247
Net income		27,373	35,919
Preferred stock dividends of subsidiaries		499	499
Net income for common stock		26,874	35,420
Bank
Revenues
Total revenues		64,348	63,619
Expenses
Total expenses		43,717	41,088
Operating income (loss)
Total operating income		20,631	22,531
Income before income taxes		20,631	22,532
Income taxes		7,156	8,133
Net income		13,475	14,399
Net income for common stock		13,475	14,399
Other
Revenues
Total revenues		72	68
Expenses
Total expenses		8,833	4,051
Operating income (loss)
Total operating income		(8,761)	(3,983)
Income before income taxes		(11,536)	(7,717)
Income taxes		(3,027)	(3,659)
Net income		(8,509)	(4,058)
Preferred stock dividends of subsidiaries		(26)	(26)
Net income for common stock		$ (8,483)	$ (4,032)

[1] As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”