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v3.3.1.900

Provisions for Federal and State Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | $ 12,413 | $ 10,809 | $ 10,052
Total Federal Tax Provision | 12,413 | 10,809 | 10,052
State |  |  |
Current | 3,530 | (387) | 386
Deferred | (500) | 3,573 | 2,214
Total State Tax Provision | 3,030 | 3,186 | 2,600
Total Provision for Federal and State Income Taxes | 15,443 | 13,995 | 12,652
Operating Loss Carryforwards |  |  |
Current Federal Tax Provision (Benefit) |  |  |
Current Federal Tax Provision (Benefit) | (3,710) | (3,179) |
Utility Plant Differences |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | 17,924 | 10,649 | 28,907
Net Operating Loss Carryforwards Carrybacks |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | 2,374 | 2,589 | (8,053)
Regulatory Assets and Liabilities |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | (6,101) | (5,946) | (11,483)
Other, net |  |  |
Deferred Federal Tax Provision (Benefit) |  |  |
Deferred Federal Tax Provision (Benefit) | (1,784) | 3,517 | $ 681
Operating Income |  |  |
Current Federal Tax Provision (Benefit) |  |  |
Current Federal Tax Provision (Benefit) | $ 3,710 | $ 3,179 |

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