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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues |  |  |  |
Total revenues | $ 796,730 | $ 854,268 | $ 1,580,794 | $ 1,669,128
Expenses |  |  |  |
Total expenses | 714,360 | 774,862 | 1,427,767 | 1,513,906
Operating income (loss) |  |  |  |
Total operating income | 82,370 | 79,406 | 153,027 | 155,222
Interest expense-other than on deposit liabilities and other bank borrowings | (19,613) | (20,199) | (39,401) | (38,738)
Allowance for borrowed funds used during construction | 398 | 893 | 1,128 | 1,763
Allowance for equity funds used during construction | 1,560 | 1,997 | 2,775 | 3,937
Income before income taxes | 64,715 | 62,097 | 117,529 | 122,184
Income taxes | 23,654 | 22,824 | 42,316 | 44,122
Net income | 41,061 | 39,273 | 75,213 | 78,062
Preferred stock dividends of subsidiaries | 473 | 473 | 946 | 946
Net income for common stock | 40,588 | 38,800 | 74,267 | 77,116
Basic earnings per common share (in dollars per share) | $ 0.41 | $ 0.40 | $ 0.75 | $ 0.80
Diluted earnings per common share (in dollars per share) | $ 0.41 | $ 0.40 | $ 0.75 | $ 0.80
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) | 98,660 | 96,693 | 98,399 | 96,430
Net effect of potentially dilutive shares (in shares) | 589 | 286 | 562 | 389
Adjusted weighted-average shares (in shares) | 99,249 | 96,979 | 98,961 | 96,819
Electric utility |  |  |  |
Revenues |  |  |  |
Total revenues | 730,688 | 789,552 | 1,449,961 | 1,539,162
Expenses |  |  |  |
Total expenses | 669,550 | 728,056 | 1,335,870 | 1,420,412
Operating income (loss) |  |  |  |
Total operating income | 61,138 | 61,496 | 114,091 | 118,750
Income before income taxes | 47,517 | 48,501 | 86,839 | 93,708
Income taxes | 18,325 | 18,626 | 32,719 | 36,034
Net income | 29,192 | 29,875 | 54,120 | 57,674
Preferred stock dividends of subsidiaries | 499 | 499 | 998 | 998
Net income for common stock | 28,693 | 29,376 | 53,122 | 56,676
Bank |  |  |  |
Revenues |  |  |  |
Total revenues | 66,027 | 64,721 | 130,783 | 129,973
Expenses |  |  |  |
Total expenses | 41,322 | 42,847 | 84,327 | 85,187
Operating income (loss) |  |  |  |
Total operating income | 24,705 | 21,874 | 46,456 | 44,786
Income before income taxes | 24,705 | 21,873 | 46,457 | 45,337
Income taxes | 8,786 | 7,684 | 16,383 | 15,271
Net income | 15,919 | 14,189 | 30,074 | 30,066
Net income for common stock | 15,919 | 14,189 | 30,074 | 30,066
Other |  |  |  |
Revenues |  |  |  |
Total revenues | 15 | (5) | 50 | (7)
Expenses |  |  |  |
Total expenses | 3,488 | 3,959 | 7,570 | 8,307
Operating income (loss) |  |  |  |
Total operating income | (3,473) | (3,964) | (7,520) | (8,314)
Income before income taxes | (7,507) | (8,277) | (15,767) | (16,861)
Income taxes | (3,457) | (3,486) | (6,786) | (7,183)
Net income | (4,050) | (4,791) | (8,981) | (9,678)
Preferred stock dividends of subsidiaries | (26) | (26) | (52) | (52)
Net income for common stock | $ (4,024) | $ (4,765) | $ (8,929) | $ (9,626)

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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 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. 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 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 5: 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=7655603&loc=d3e1448-109256 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 Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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