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Segment financial information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment financial information
Total revenues	$ 550,960	$ 637,862
Income (loss) before income taxes	51,126	52,318
Income taxes (benefit)	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
Total assets	11,870,506		$ 11,782,018
Electric utility
Segment financial information
Total revenues	482,052	573,442
Income (loss) before income taxes	40,419	43,223
Income taxes (benefit)	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
Total assets	5,662,371		5,672,210
Bank
Segment financial information
Total revenues	68,840	64,348
Income (loss) before income taxes	19,594	20,631
Income taxes (benefit)	6,921	7,156
Net income	12,673	13,475
Net income for common stock	12,673	13,475
Total assets	6,140,514		6,014,755
Other
Segment financial information
Total revenues	68	72
Income (loss) before income taxes	(8,887)	(11,536)
Income taxes (benefit)	(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)
Total assets	67,621		$ 95,053
Revenues from external customers
Segment financial information
Total revenues	550,960	637,862
Revenues from external customers | Electric utility
Segment financial information
Total revenues	482,045	573,431
Revenues from external customers | Bank
Segment financial information
Total revenues	68,840	64,348
Revenues from external customers | Other
Segment financial information
Total revenues	75	83
Intersegment revenues (eliminations) | Electric utility
Segment financial information
Total revenues	7	11
Intersegment revenues (eliminations) | Other
Segment financial information
Total revenues	$ (7)	$ (11)

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