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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME [Abstract] |  |  |
Operating Revenues | $ 117,139 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 114,846 us-gaap_RegulatedAndUnregulatedOperatingRevenue | $ 110,379 us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Expenses: |  |  |
Operations and Maintenance | 59,129 msex_OperationsAndMaintenance | 60,748 msex_OperationsAndMaintenance | 60,458 msex_OperationsAndMaintenance
Depreciation | 11,444 us-gaap_CostOfGoodsSoldDepreciationAndAmortization | 10,988 us-gaap_CostOfGoodsSoldDepreciationAndAmortization | 10,409 us-gaap_CostOfGoodsSoldDepreciationAndAmortization
Other Taxes | 12,174 us-gaap_TaxesOther | 12,140 us-gaap_TaxesOther | 11,865 us-gaap_TaxesOther
Total Operating Expenses | 82,747 us-gaap_OperatingExpenses | 83,876 us-gaap_OperatingExpenses | 82,732 us-gaap_OperatingExpenses
Operating Income | 34,392 us-gaap_OperatingIncomeLoss | 30,970 us-gaap_OperatingIncomeLoss | 27,647 us-gaap_OperatingIncomeLoss
Other Income (Expense): |  |  |
Public Utilities, Allowance for Funds Used During Construction, Additions | 317 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions | 314 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions | 484 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Other Income | 281 us-gaap_OtherIncome | 183 us-gaap_OtherIncome | 517 us-gaap_OtherIncome
Other Expense | (1,001)us-gaap_OtherExpenses | (406)us-gaap_OtherExpenses | (144)us-gaap_OtherExpenses
Total Other Income (Expense), net | (403)us-gaap_NonoperatingIncomeExpense | 91 us-gaap_NonoperatingIncomeExpense | 857 us-gaap_NonoperatingIncomeExpense
Interest Charges | 5,607 us-gaap_InterestExpense | 5,807 us-gaap_InterestExpense | 6,725 us-gaap_InterestExpense
Income before Income Taxes | 28,382 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 25,254 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 21,779 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Taxes | 9,937 us-gaap_IncomeTaxExpenseBenefit | 8,621 us-gaap_IncomeTaxExpenseBenefit | 7,383 us-gaap_IncomeTaxExpenseBenefit
Net Income | 18,445 us-gaap_NetIncomeLoss | 16,633 us-gaap_NetIncomeLoss | 14,396 us-gaap_NetIncomeLoss
Preferred Stock Dividend Requirements | 151 us-gaap_PreferredStockDividendsIncomeStatementImpact | 190 us-gaap_PreferredStockDividendsIncomeStatementImpact | 206 us-gaap_PreferredStockDividendsIncomeStatementImpact
Earnings Applicable to Common Stock | $ 18,294 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 16,443 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 14,190 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share of Common Stock: |  |  |
Basic | $ 1.14 us-gaap_EarningsPerShareBasic | $ 1.04 us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic
Diluted | $ 1.13 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted
Average Number of Common Shares Outstanding : |  |  |
Basic | 16,052 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,868 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,733 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 16,226 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,110 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,995 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash Dividends Paid per Common Share (in dollars per share) | $ 0.763 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.753 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.743 us-gaap_CommonStockDividendsPerShareCashPaid

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