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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating revenues [Abstract]    
Operating revenues $ 261,665us-gaap_Revenues $ 293,386us-gaap_Revenues
Operating expenses [Abstract]    
Cost of Revenue 125,705us-gaap_CostOfRevenue 155,201us-gaap_CostOfRevenue
Operations and maintenance 54,116us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses 35,386us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
General taxes 8,732us-gaap_TaxesExcludingIncomeAndExciseTaxes 8,182us-gaap_TaxesExcludingIncomeAndExciseTaxes
Depreciation and amortization 20,111us-gaap_DepreciationAndAmortization 19,589us-gaap_DepreciationAndAmortization
Total operating expenses 208,664us-gaap_OperatingExpenses 218,358us-gaap_OperatingExpenses
Income from operations 53,001us-gaap_OperatingIncomeLoss 75,028us-gaap_OperatingIncomeLoss
Other income and expense, net 5,049us-gaap_OtherNonoperatingIncomeExpense 1,383us-gaap_OtherNonoperatingIncomeExpense
Interest expense, net 10,481us-gaap_InterestExpense 11,542us-gaap_InterestExpense
Income before income taxes 47,569us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 64,869us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 19,083us-gaap_IncomeTaxExpenseBenefit 26,985us-gaap_IncomeTaxExpenseBenefit
Net income 28,486us-gaap_NetIncomeLoss 37,884us-gaap_NetIncomeLoss
Other comprehensive income [Abstract]    
Amortization of non-qualified employee benefit plan liability, net of taxes of $216 and $109 for the three months ended March 31, 2015 and 2014, respectively 332us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 165us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Comprehensive income $ 28,818us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 38,049us-gaap_OtherComprehensiveIncomeLossNetOfTax
Average common shares outstanding [Abstract]    
Basic 27,301us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,094us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 27,369us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,126us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share of common stock [Abstract]    
Basic $ (1.04)us-gaap_EarningsPerShareBasic $ (1.40)us-gaap_EarningsPerShareBasic
Diluted $ 1.04us-gaap_EarningsPerShareDiluted $ 1.40us-gaap_EarningsPerShareDiluted
Dividends declared per share of common stock $ 0.465us-gaap_CommonStockDividendsPerShareDeclared $ 0.460us-gaap_CommonStockDividendsPerShareDeclared