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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |
Officer cash bonus target minimum | 30.00%hiw_OfficerCashBonusTargetMinimum |  |  |  |  |
Officer cash bonus target maximum | 130.00%hiw_OfficerCashBonusTargetMaximum |  |  |  |  |
Officer cash bonus performance factor minimum | 0.00%hiw_OfficerCashBonusPerformanceFactorMinimum |  |  |  |  |
Officer cash bonus performance factor maximum | 200.00%hiw_OfficerCashBonusPerformanceFactorMaximum |  |  |  |  |
Other management cash bonus target minimum | 10.00%hiw_OtherManagementCashBonusTargetMinimum |  |  |  |  |
Other management cash bonus target maximum | 30.00%hiw_OtherManagementCashBonusTargetMaximum |  |  |  |  |
Number of outstanding options and warrants | 592,321 hiw_NumberOfOutstandingOptionsAndWarrants |  | 889,382 hiw_NumberOfOutstandingOptionsAndWarrants |  |  |
Possible future share issuance authorized under equity incentive plans | 1,382,406 hiw_PossibleFutureShareIssuanceAuthorizedUnderEquityIncentivePlan |  | 1,742,237 hiw_PossibleFutureShareIssuanceAuthorizedUnderEquityIncentivePlan |  |  |
Total shares reserved for future issuance | 1,974,727 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  | 2,631,619 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |
Possible future share issuance authorized under equity incentive plan restricted stock | 300,000 hiw_PossibleFutureShareIssuanceAuthorizedUnderEquityIncentivePlanRestrictedStock |  |  |  |  |
Stock-based compensation expense | $ 6,939,000 us-gaap_ShareBasedCompensation |  | $ 6,899,000 us-gaap_ShareBasedCompensation |  | $ 7,613,000 us-gaap_ShareBasedCompensation |
Total unrecognized stock-based compensation costs | 4,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |
Weighted average remaining term of vesting periods (in years) | 2 years 4 months |  |  |  |  |
401(k) Savings Plan [Abstract] |  |  |  |  |  |
401(k) employer match percentage | 75.00%hiw_A401KEmployerMatchPercentage |  |  |  |  |
401(k) employer match salary limit percentage | 6.00%hiw_A401KEmployerMatchSalaryLimitPercentage |  |  |  |  |
401(k) employer contribution | 1,200,000 hiw_A401KEmployerContribution |  | 1,100,000 hiw_A401KEmployerContribution |  | 1,000,000 hiw_A401KEmployerContribution |
Retirement Plan [Abstract] |  |  |  |  |  |
Retirement plan qualification years of service (in years) | 30 years |  |  |  |  |
Retirement plan qualification age | 55 years |  |  |  |  |
Retirement plan qualification minimum years of service (in years) | 10 years |  |  |  |  |
2009 and prior retirement plan immediate vesting percentage | 100.00%hiw_A2009AndPriorRetirementPlanImmediateVestingPercentage |  |  |  |  |
Deferred Compensation [Abstract] |  |  |  |  |  |
Marketable securities of non-qualified deferred compensation plan fair value disclosure | 3,635,000 hiw_MarketableSecuritiesOfNonQualifiedDeferredCompensationPlanFairValueDisclosure |  | 3,996,000 hiw_MarketableSecuritiesOfNonQualifiedDeferredCompensationPlanFairValueDisclosure |  | 3,354,000 hiw_MarketableSecuritiesOfNonQualifiedDeferredCompensationPlanFairValueDisclosure |
Non Qualified Deferred Compensation Obligation Fair Value Disclosure [Roll Forward] |  |  |  |  |  |
Beginning deferred compensation liability | 3,996,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |  | 3,354,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |  | 3,149,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |
Mark to market adjustment to deferred compensation (in general and administrative expenses) | 235,000 hiw_UnrealizedGainLossMarketableSecuritiesDeferredCompensation |  | 803,000 hiw_UnrealizedGainLossMarketableSecuritiesDeferredCompensation |  | 475,000 hiw_UnrealizedGainLossMarketableSecuritiesDeferredCompensation |
Distributions from deferred compensation plans | (596,000)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid |  | (161,000)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid |  | (270,000)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid |
Ending deferred compensation liability | 3,635,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |  | 3,996,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |  | 3,354,000 hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure |
Employee Stock Purchase Plan [Abstract] |  |  |  |  |  |
Employee stock purchase plan salary limit percentage | 25.00%hiw_EmployeeStockPurchasePlanSalaryLimitPercentage |  |  |  |  |
Employee stock purchase plan market percentage | 85.00%hiw_EmployeeStockPurchasePlanMarketPercentage |  |  |  |  |
Number of days at end of quarter used to calculate ESPP discount | 5 days |  |  |  |  |
Shares of Common Stock issued under the employee stock purchase plans | 28,682 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  | 27,250 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  | 34,126 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |
Employee Stock Purchase Plan Market Percentage Discount | 15.00%hiw_EmployeeStockPurchasePlanMarketPercentageDiscount |  |  |  |  |
Discount on newly issued shares expensed as additional compensation | 200,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition |  | 200,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition |  | 200,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition |
Stock Options [Member] |  |  |  |  |  |
Stock Option Activity Rollforward [Abstract] |  |  |  |  |  |
Balance of options outstanding | 874,382 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [1],[2] | 1,129,309 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 1,209,455 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options granted | 190,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 168,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 190,886 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options canceled | (134,628)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Options exercised | (352,763)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | (423,627)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | (271,032)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Balance of options outstanding | 577,321 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [1],[2] | 874,382 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [1],[2] | 1,129,309 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options outstanding, weighted average exercise price | $ 32.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 30.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 29.08 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options granted, weighted average exercise price | $ 37.90 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 36.50 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 31.97 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options canceled, weighted average exercise price | $ 41.93 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Options exercised, weighted average exercise price | $ 27.21 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 28.22 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 26.87 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options outstanding, weighted average exercise price | $ 34.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [1],[2] | $ 32.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 30.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Weighted average remaining life of outstanding options | 5 years 9 months 20 days |  |  |  |  |
Options exercisable | 128,364 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Weighted average exercise price | $ 31.44 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Weighted average remaining life | 3 years 1 month 6 days |  |  |  |  |
Intrinsic value | 1,600,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Cash received or receivable from options exercised | 11,100,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 12,500,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 7,400,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Total instrinsic value of options exercised | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 3,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 1,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Total intrinsic value of options outstanding | 5,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 4,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Prior to 2005 and 2014 Stock Options [Member] |  |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |  |  |  |
Option expiration period (in years) | 10 years |  |  |  |  |
Grant date fair value of each stock option granted (in dollars per option) | $ 6.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_Priorto2005and2014StockOptionsMember |  |  |  |  |
Assumptions Used in Determining Fair Values of Options/Restricted Stock Granted: |  |  |  |  |  |
Risk free interest rate | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_Priorto2005and2014StockOptionsMember | [3] |  |  |  |
Common stock dividend yield | 4.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_Priorto2005and2014StockOptionsMember | [4] |  |  |  |
Expected volatility rate | 30.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_Priorto2005and2014StockOptionsMember | [5] |  |  |  |
Average expected option life (in years) | 5 years 9 months | [6] |  |  |  |
Dividends paid for previous year | 1 year |  |  |  |  |
2005 to 2013 Stock Options [Member] |  |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |  |  |  |
Option expiration period (in years) | 7 years |  |  |  |  |
Grant date fair value of each stock option granted (in dollars per option) |  |  | $ 6.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember |  | $ 5.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember |
Assumptions Used in Determining Fair Values of Options/Restricted Stock Granted: |  |  |  |  |  |
Risk free interest rate |  |  | 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [3] | 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [3]
Common stock dividend yield |  |  | 4.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [4] | 5.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [4]
Expected volatility rate |  |  | 32.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [5] | 33.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_A2005to2013StockOptionsMember | [5]
Average expected option life (in years) |  |  | 5 years 9 months | [6] | 5 years 9 months | [6]
Time-Based Restricted Stock [Member] |  |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |  |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |  |  |  |
Balance of restricted stock outstanding | 212,796 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 222,502 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 224,661 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Awarded and issued | 94,932 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | 86,144 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | 90,983 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7]
Vested | (85,660)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8] | (94,037)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8] | (92,239)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8]
Forfeited | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | (1,813)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | (903)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Balance of restricted stock outstanding | 222,068 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 212,796 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 222,502 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Restricted stock outstanding, weighted average grant date fair value | $ 33.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 30.31 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 28.02 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Awarded and issued, weighted average grant date fair value | $ 37.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | $ 36.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | $ 32.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7]
Vested, weighted average grant date fair value | $ 32.87 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8] | $ 27.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8] | $ 27.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [8]
Forfeited, weighted average grant date fair value | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 36.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 30.12 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Restricted stock outstanding, weighted average grant date fair value | $ 35.97 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 33.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | $ 30.31 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Grant date fair value of restricted stock | $ 37.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | $ 36.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7] | $ 32.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember | [7]
Fair value at grant date of restricted stock issued | 3,600,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 3,200,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 2,900,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Vesting date fair value of restricted stock | 3,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 3,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |  | 2,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TimeBasedRestrictedStockMember |
Total Return-Based Restricted Stock [Member] |  |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 3 years |  |  |  |  |
Assumptions Used in Determining Fair Values of Options/Restricted Stock Granted: |  |  |  |  |  |
Risk free interest rate | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [9] | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [9] | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [9]
Common stock dividend yield | 4.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [10] | 4.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [10] | 5.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [10]
Expected volatility rate | 43.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [11] | 43.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [11] | 43.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [11]
Dividends paid for previous year | 1 year |  |  |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |  |  |  |
Balance of restricted stock outstanding | 133,388 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 125,288 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 122,829 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Awarded and issued | 74,569 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | 65,486 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | 67,902 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12]
Vested | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13] | (41,863)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13] | (32,722)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13]
Forfeited | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | (15,523)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | (32,721)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Balance of restricted stock outstanding | 207,957 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 133,388 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 125,288 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Restricted stock outstanding, weighted average grant date fair value | $ 35.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 32.87 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 34.86 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Awarded and issued, weighted average grant date fair value | $ 35.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | $ 31.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | $ 38.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12]
Vested, weighted average grant date fair value | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13] | $ 24.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13] | $ 29.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [13]
Forfeited, weighted average grant date fair value | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 24.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 29.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Restricted stock outstanding, weighted average grant date fair value | $ 35.70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 35.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 32.87 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Percentage of return-based restricted stock issued to officers that will vest, minimum | 0.00%hiw_PerformancePlanFactorMinimum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 0.00%hiw_PerformancePlanFactorMinimum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 0.00%hiw_PerformancePlanFactorMinimum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Percentage of return-based restricted stock issued to officers that will vest, maximum | 150.00%hiw_PerformancePlanFactorMaximum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 150.00%hiw_PerformancePlanFactorMaximum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 250.00%hiw_PerformancePlanFactorMaximum / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Company total return, total return-based restricted stock | 100.00%hiw_TotalReturnbasedRestrictedStockMinimumCompanyTotalReturnPercentage / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  |  |  |  |
Vesting percentage, total return-based restricted stock | 75.00%hiw_TotalReturnbasedRestrictedStockVestingPercentage / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 50.00%hiw_TotalReturnbasedRestrictedStockVestingPercentage / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 50.00%hiw_TotalReturnbasedRestrictedStockVestingPercentage / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Grant date fair value of restricted stock | $ 35.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | $ 31.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12] | $ 38.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember | [12]
Fair value at grant date of restricted stock issued | 2,700,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 2,100,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | 2,600,000 hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Vesting date fair value of restricted stock |  |  | $ 1,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |  | $ 1,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember |
Period preceding date of grant | 0 years 3 months |  |  |  |  |
[1] | The Company had 128,364 options exercisable at December 31, 2014 with a weighted average exercise price of $31.44, weighted average remaining life of 3.1 years and intrinsic value of $1.6 million. Of these exercisable options, there were no exercise prices higher than the market price of our Common Stock at December 31, 2014.
[2] | The outstanding options at December 31, 2014 had a weighted average remaining life of 5.8 years.
[3] | Represents the interest rate as of the grant date on US treasury bonds having the same life as the estimated life of the option grants.
[4] | The dividend yield is calculated utilizing the dividends paid for the previous one-year period and the per share price of Common Stock on the date of grant.
[5] | Based on the historical volatility of Common Stock over a period relevant to the related stock option grant.
[6] | The average expected option life is based on an analysis of the Company's historical data.
[7] | The weighted average fair value at grant date of time-based restricted stock issued during the years ended December 31, 2014, 2013 and 2012 was $3.6 million, $3.2 million and $2.9 million, respectively.
[8] | The vesting date fair value of time-based restricted stock that vested during the years ended December 31, 2014, 2013 and 2012 was $3.2 million, $3.4 million and $2.9 million, respectively. Vested shares include those shares surrendered by employees to satisfy tax withholding obligations in connection with such vesting.
[9] | Represents the interest rate as of the grant date on US treasury bonds having the same life as the estimated life of the total return-based restricted stock grants.
[10] | The dividend yield is calculated utilizing the dividends paid for the previous one-year period and the average per share price of Common Stock during the three-month period preceding the date of grant.
[11] | Based on the historical volatility of Common Stock over a period relevant to the related total return-based restricted stock grant.
[12] | The fair value at grant date of total return-based restricted stock issued during the years ended December 31, 2014, 2013 and 2012 was $2.7 million, $2.1 million and $2.6 million, respectively.
[13] | The vesting date fair value of total return-based restricted stock that vested during the years ended December 31, 2013 and 2012 was $1.5 million and $1.1 million, respectively. Vested shares include those shares surrendered by employees to satisfy tax withholding obligations in connection with such vesting. There were no vested shares of total return-based restricted stock during the year ended December 31, 2014.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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