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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Income Tax Expense | The following tables provide: (a) the components of income tax expense in 2012, 2011, and 2010; (b) the reconciliation between the statutory federal income tax rate and the effective income tax rate for 2012, 2011, and 2010; and (c) the components of accumulated deferred income tax assets and liabilities at December 31, 2012 and 2011.
For the Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
(in thousands) |  |  |  |  |  |  |  |  |
Current Income Tax Expense |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 3,483 |  |  | $ | 0 |  |  | $ | 1,566 |
State |  |  | 1,990 |  |  |  | 742 |  |  |  | 2,116 |
Investment tax credit adjustments, net |  |  | (58 | ) |  |  | (73 | ) |  |  | (91 | )
Total current income tax expense |  |  | 5,415 |  |  |  | 669 |  |  |  | 3,591 |
Deferred Income Tax Expense (1) |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 14,301 |  |  |  | 16,885 |  |  |  | 16,964 |
Deferred gas costs |  |  | 515 |  |  |  | 591 |  |  |  | (2,505 | )
Pensions and other employee benefits |  |  | 553 |  |  |  | 786 |  |  |  | (402 | )
FPU merger related premium cost and deferred gain |  |  | (509 | ) |  |  | — |  |  |  | (13 | )
Amortization of intangibles |  |  | 80 |  |  |  | 17 |  |  |  | (211 | )
Environmental expenditures |  |  | (82 | ) |  |  | (65 | ) |  |  | 32 |
Net operating loss carryforwards |  |  | 740 |  |  |  | (1,000 | ) |  |  | 99 |
Reserve for insurance deductibles |  |  | — |  |  |  | 18 |  |  |  | (419 | )
Other |  |  | (1,717 | ) |  |  | 88 |  |  |  | (213 | )
Total deferred income tax expense |  |  | 13,881 |  |  |  | 17,320 |  |  |  | 13,332 |
Total Income Tax Expense |  | $ | 19,296 |  |  | $ | 17,989 |  |  | $ | 16,923 |
(1) | Includes $1,934,000, $2,280,000, and $1,963,000 of deferred state income taxes for the years 2012, 2011 and 2010, respectively.
Summary of Reconciliation of Statutory Federal Tax and Effective Income Tax Rates |
Reconciliation of Effective Income Tax Rates |  |  |  |  |  |  |  |  |  |  |  |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense (2) |  | $ | 16,745 |  |  | $ | 16,146 |  |  | $ | 15,053 |
State income taxes, net of federal benefit |  |  | 2,659 |  |  |  | 2,216 |  |  |  | 2,083 |
Merger related costs |  |  | — |  |  |  | — |  |  |  | 70 |
ESOP dividend deduction |  |  | (235 | ) |  |  | (236 | ) |  |  | (266 | )
Other |  |  | 127 |  |  |  | (137 | ) |  |  | (17 | )
Total income tax expense |  | $ | 19,296 |  |  | $ | 17,989 |  |  | $ | 16,923 |
Effective income tax rate |  |  | 40.07 | % |  |  | 39.44 | % |  |  | 39.38 | %
(2) | Federal income taxes were recorded at 35% for each year represented.
Schedule of Accumulated Deferred Income Tax Assets and Liabilities |
At December 31, |  | 2012 |  |  | 2011 |
(in thousands) |  |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  |  |  |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property, plant and equipment |  | $ | 118,212 |  |  | $ | 105,850 |
Acquisition adjustment |  |  | 17,440 |  |  |  | 18,090 |
Deferred gas costs |  |  | 816 |  |  |  | 301 |
Loss on reacquired debt |  |  | 572 |  |  |  | 608 |
Other |  |  | 2,784 |  |  |  | 3,872 |
Total deferred income tax liabilities |  |  | 139,824 |  |  |  | 128,721 |
Deferred income tax assets: |  |  |  |  |  |  |  |
Pension and other employee benefits |  |  | 7,382 |  |  |  | 7,796 |
Environmental costs |  |  | 1,917 |  |  |  | 1,835 |
Net operating loss carryforwards |  |  | 1,587 |  |  |  | 2,401 |
Self insurance |  |  | 484 |  |  |  | 452 |
Storm reserve liability |  |  | 1,058 |  |  |  | 1,085 |
Other |  |  | 2,982 |  |  |  | 2,240 |
Total deferred income tax assets |  |  | 15,410 |  |  |  | 15,809 |
Deferred Income Taxes Per Consolidated Balance Sheet |  | $ | 124,414 |  |  | $ | 112,912 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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