Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Revenues
Total revenues	$ 623,912	$ 798,657	$ 1,261,774		$ 1,582,406
Expenses
Total expenses	551,182	715,474	1,119,538		1,410,009
Operating income (loss)
Total operating income	72,730	83,183	142,236		172,397
Interest expense, net—other than on deposit liabilities and other bank borrowings	(18,906)	(20,022)	(38,006)		(39,478)
Allowance for borrowed funds used during construction	682	523	1,181		1,137
Allowance for equity funds used during construction	1,896	1,387	3,309	[1]	2,996	[1]
Income before income taxes	56,402	65,071	108,720		137,052
Income taxes	20,911	23,317	40,890		49,038
Net income	35,491	41,754	67,830	[1]	88,014	[1]
Preferred stock dividends of subsidiaries	473	473	946		946
Net income for common stock	$ 35,018	$ 41,281	$ 66,884		$ 87,068
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.41	$ 0.63		$ 0.86
Diluted earnings per common share (in dollars per share)	0.33	0.41	0.63		0.85
Dividends per common share (in dollars per share)	$ 0.31	$ 0.31	$ 0.62		$ 0.62
Weighted-average number of common shares outstanding (in shares)	107,418	101,495	105,361		101,439
Net effect of potentially dilutive shares (in shares)	276	330	298		606
Adjusted weighted-average shares (in shares)	107,694	101,825	105,659		102,045
Electric utility
Revenues
Total revenues	$ 558,163	$ 738,429	$ 1,131,605		$ 1,458,491
Expenses
Total expenses	492,002	668,361	1,007,808		1,317,757
Operating income (loss)
Total operating income	66,161	70,068	123,797		140,734
Income before income taxes	52,451	55,126	95,674		112,292
Income taxes	19,111	20,397	34,961		41,644
Net income	33,340	34,729	60,713		70,648
Preferred stock dividends of subsidiaries	499	499	998		998
Net income for common stock	32,841	34,230	59,715		69,650
Bank
Revenues
Total revenues	65,783	60,616	130,131		124,235
Expenses
Total expenses	46,057	42,660	89,774		83,748
Operating income (loss)
Total operating income	19,726	17,956	40,357		40,487
Income before income taxes	19,726	17,956	40,357		40,488
Income taxes	6,875	6,420	14,031		14,553
Net income	12,851	11,536	26,326		25,935
Net income for common stock	12,851	11,536	26,326		25,935
Other
Revenues
Total revenues	(34)	(388)	38		(320)
Expenses
Total expenses	13,123	4,453	21,956		8,504
Operating income (loss)
Total operating income	(13,157)	(4,841)	(21,918)		(8,824)
Income before income taxes	(15,775)	(8,011)	(27,311)		(15,728)
Income taxes	(5,075)	(3,500)	(8,102)		(7,159)
Net income	(10,700)	(4,511)	(19,209)		(8,569)
Preferred stock dividends of subsidiaries	(26)	(26)	(52)		(52)
Net income for common stock	$ (10,674)	$ (4,485)	$ (19,157)		$ (8,517)

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