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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenues |  |  |
Total revenues | $ 3,242,335 | $ 2,664,982 | $ 2,309,590
Expenses |  |  |
Total expenses | 2,952,639 | 2,408,771 | 2,121,926
Operating income (loss) |  |  |
Total operating income (loss) | 289,696 | 256,211 | 187,664
Interest expense - other than on deposit liabilities and other bank borrowings | (82,106) | (81,538) | (76,330)
Allowance for borrowed funds used during construction | 2,498 | 2,558 | 5,268
Allowance for equity funds used during construction | 5,964 | 6,016 | 12,222
Income before income taxes | 216,052 | 183,247 | 128,824
Income taxes | 75,932 | 67,822 | 43,923
Net income | 140,120 | 115,425 | 84,901
Preferred stock dividends of subsidiaries | 1,890 | 1,890 | 1,890
Net income for common stock | 138,230 | 113,535 | 83,011
Basic earnings per common share (in dollars per share) | $ 1.45 | $ 1.22 | $ 0.91
Diluted earnings per common share (in dollars per share) | $ 1.44 | $ 1.21 | $ 0.91
Dividends per common share (in dollars per share) | $ 1.24 | $ 1.24 | $ 1.24
Weighted-average number of common shares outstanding | 95,510 | 93,421 | 91,396
Dilutive effect of share-based compensation (in shares) | 310 | 272 | 120
Adjusted weighted-average shares | 95,820 | 93,693 | 91,516
Electric utility |  |  |
Revenues |  |  |
Total revenues | 2,978,690 | 2,382,366 | 2,035,009
Expenses |  |  |
Total expenses | 2,763,556 | 2,203,978 | 1,865,338
Operating income (loss) |  |  |
Total operating income (loss) | 215,134 | 178,388 | 169,671
Income before income taxes | 163,565 | 125,452 | 129,217
Income taxes | 61,584 | 46,868 | 47,776
Net income | 101,981 | 78,584 | 81,441
Preferred stock dividends of subsidiaries | 1,995 | 1,995 | 1,995
Net income for common stock | 99,986 | 76,589 | 79,446
Bank |  |  |
Revenues |  |  |
Total revenues | 264,407 | 282,693 | 274,719
Expenses |  |  |
Total expenses | 172,806 | 190,105 | 242,955
Operating income (loss) |  |  |
Total operating income (loss) | 91,601 | 92,588 | 31,764
Income before income taxes | 91,536 | 92,512 | 31,705
Income taxes | 31,693 | 34,056 | 9,938
Net income | 59,843 | 58,456 | 21,767
Net income for common stock | 59,843 | 58,456 | 21,767
Other |  |  |
Revenues |  |  |
Total revenues | (762) | (77) | (138)
Expenses |  |  |
Total expenses | 16,277 | 14,688 | 13,633
Operating income (loss) |  |  |
Total operating income (loss) | (17,039) | (14,765) | (13,771)
Income before income taxes | (39,049) | (34,717) | (32,098)
Income taxes | (17,345) | (13,102) | (13,791)
Net income | (21,704) | (21,615) | (18,307)
Preferred stock dividends of subsidiaries | (105) | (105) | (105)
Net income for common stock | $ (21,599) | $ (21,510) | $ (18,202)

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration