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Income Taxes - Schedule of Accumulated Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
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 Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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