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REGULATED OPERATING EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Regulated Operating Expenses        
Electric transmission and distribution expense $ 7,100ede_UtilitiesOperatingExpenseElectricTransmissionAndDistributionExpense $ 6,798ede_UtilitiesOperatingExpenseElectricTransmissionAndDistributionExpense $ 28,221ede_UtilitiesOperatingExpenseElectricTransmissionAndDistributionExpense $ 23,633ede_UtilitiesOperatingExpenseElectricTransmissionAndDistributionExpense
Natural gas transmission and distribution expense 677ede_UtilitiesOperatingExpenseNaturalGasTransmissionAndDistributionExpense 675ede_UtilitiesOperatingExpenseNaturalGasTransmissionAndDistributionExpense 2,365ede_UtilitiesOperatingExpenseNaturalGasTransmissionAndDistributionExpense 2,627ede_UtilitiesOperatingExpenseNaturalGasTransmissionAndDistributionExpense
Power operation expense (other than fuel) 5,317ede_UtilitiesOperatingExpensePowerOperationExpense 3,991ede_UtilitiesOperatingExpensePowerOperationExpense 17,415ede_UtilitiesOperatingExpensePowerOperationExpense 15,989ede_UtilitiesOperatingExpensePowerOperationExpense
Customer accounts and assistance expense 2,704ede_UtilitiesOperatingExpenseCustomerAccountsAndAssistanceExpense 2,836ede_UtilitiesOperatingExpenseCustomerAccountsAndAssistanceExpense 11,106ede_UtilitiesOperatingExpenseCustomerAccountsAndAssistanceExpense 11,436ede_UtilitiesOperatingExpenseCustomerAccountsAndAssistanceExpense
Employee pension expense 2,684ede_UtilitiesOperatingExpenseEmployeePensionExpense 2,626ede_UtilitiesOperatingExpenseEmployeePensionExpense 10,648ede_UtilitiesOperatingExpenseEmployeePensionExpense 10,720ede_UtilitiesOperatingExpenseEmployeePensionExpense
Employee healthcare expense 2,234ede_UtilitiesOperatingExpenseEmployeeHealthcareExpense 1,725ede_UtilitiesOperatingExpenseEmployeeHealthcareExpense 9,656ede_UtilitiesOperatingExpenseEmployeeHealthcareExpense 9,128ede_UtilitiesOperatingExpenseEmployeeHealthcareExpense
General office supplies and expense 2,834ede_UtilitiesOperatingExpenseGeneralOfficeSuppliesAndExpense 4,191ede_UtilitiesOperatingExpenseGeneralOfficeSuppliesAndExpense 13,666ede_UtilitiesOperatingExpenseGeneralOfficeSuppliesAndExpense 13,613ede_UtilitiesOperatingExpenseGeneralOfficeSuppliesAndExpense
Administrative and general expense 4,556ede_UtilitiesOperatingExpenseAdministrativeAndGeneralExpense 4,225ede_UtilitiesOperatingExpenseAdministrativeAndGeneralExpense 14,716ede_UtilitiesOperatingExpenseAdministrativeAndGeneralExpense 14,710ede_UtilitiesOperatingExpenseAdministrativeAndGeneralExpense
Allowance for uncollectible accounts 327ede_UtilitiesOperatingExpenseAllowanceForUncollectibleAccounts 773ede_UtilitiesOperatingExpenseAllowanceForUncollectibleAccounts 2,975ede_UtilitiesOperatingExpenseAllowanceForUncollectibleAccounts 3,692ede_UtilitiesOperatingExpenseAllowanceForUncollectibleAccounts
Miscellaneous expense 118us-gaap_UtilitiesOperatingExpenseOther 117us-gaap_UtilitiesOperatingExpenseOther 517us-gaap_UtilitiesOperatingExpenseOther 605us-gaap_UtilitiesOperatingExpenseOther
Total $ 28,551us-gaap_UtilitiesOperatingExpenseOperations $ 27,957us-gaap_UtilitiesOperatingExpenseOperations $ 111,285us-gaap_UtilitiesOperatingExpenseOperations $ 106,153us-gaap_UtilitiesOperatingExpenseOperations