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Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Deferred Tax Assets      
Retirement Benefit Obligations $ 32,249   $ 38,915
Net Operating Loss Carryforwards 10,773 $ 3,700 12,686
Tax Credit Carryforwards 2,704   3,536
Other, net 1,571   1,155
Total Deferred Tax Assets 47,297   56,292
Deferred Tax Liabilities      
Utility Plant Differences 132,682   127,932
Regulatory Assets & Liabilities 6,429   9,323
Other, net 5,964   1,894
Total Deferred Tax Liabilities 145,075   139,149
Net Deferred Tax Liabilities $ 97,778   $ 82,857