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Income taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Federal |  |  |
Current | $ (7,638,000) | $ (25,446,000) | $ 25,691,000
Deferred | 73,494,000 | 85,268,000 | 14,161,000
Deferred tax credits, net |  | (901,000) | (593,000)
Federal taxes | 65,856,000 | 58,921,000 | 39,259,000
State |  |  |
Current | 2,437,000 | (7,392,000) | 6,930,000
Deferred | 5,949,000 | 13,425,000 | (783,000)
Deferred tax credits, net | 1,690,000 | 2,868,000 | (1,483,000)
State taxes | 10,076,000 | 8,901,000 | 4,664,000
Federal and state taxes | 75,932,000 | 67,822,000 | 43,923,000
Reconciliation percentage of amount of income taxes computed at federal statutory rate | 35.00% | 35.00% | 35.00%
Amount at the federal statutory income tax rate | 75,618,000 | 64,136,000 | 45,088,000
Increase (decrease) resulting from: |  |  |
State income taxes, net of effect on federal income taxes | 6,550,000 | 5,786,000 | 3,033,000
Other, net | (6,236,000) | (2,100,000) | (4,198,000)
Federal and state taxes | 75,932,000 | 67,822,000 | 43,923,000
Effective income tax rate (as a percent) | 35.10% | 37.00% | 34.10%
Deferred tax assets |  |  |
Allowance for loan losses | 14,076,000 | 16,461,000 |
Retirement benefits | 6,175,000 |  |
Other | 33,217,000 | 35,878,000 |
Total deferred tax assets | 53,468,000 | 52,339,000 |
Deferred tax liabilities |  |  |
Property, plant and equipment | 255,488,000 | 188,490,000 |
Retirement benefits |  | 2,479,000 |
Goodwill | 22,028,000 | 20,130,000 |
Regulatory assets, excluding amounts attributable to property, plant and equipment | 32,343,000 | 32,074,000 |
FHLB stock dividend | 20,552,000 | 20,552,000 |
Change in accounting method related to repairs | 48,566,000 | 46,702,000 |
Other | 28,542,000 | 20,870,000 |
Total deferred tax liabilities | 407,519,000 | 331,297,000 |
Net deferred income tax liability | 354,051,000 | 278,958,000 |
Interest income on income tax refunds |  | 9,700,000 |
Interest expense/(credit adjustments to interest expense) on income taxes | (1,200,000) | (900,000) | 700,000
Amount of accrued interest related to uncertain tax positions | 1,500,000 | 2,700,000 |
Portion of liability for uncertain tax positions, if recognized, would affect the Company's effective tax rate | 900,000 |  |
Estimated decrease in the liability for uncertain tax positions within the next 12 months which is reasonably possible | 5,000,000 |  |
Changes in total unrecognized tax benefits |  |  |
Unrecognized tax benefits, at the beginning of the period | 15,400,000 | 26,500,000 | 27,900,000
Additions based on tax positions taken during the year |  | 11,000,000 |
Reductions based on tax positions taken during the year | (600,000) |  |
Additions for tax positions of prior years | 100,000 | 2,200,000 | 400,000
Reductions for tax positions of prior years | (8,100,000) | (18,200,000) | (1,800,000)
Settlements |  | (6,100,000) |
Lapses of statute of limitations | (1,100,000) |  |
Unrecognized tax benefits, at the end of the period | $ 5,700,000 | $ 15,400,000 | $ 26,500,000

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- Definition This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15 -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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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