XML 79 R56.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Employee Benefit Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Benefits [Abstract] |  |  |
Outstanding stock options and warrants | 467,291 | 527,067 |
Possible future share issuance authorized under equity incentive plans | 2,242,360 | 2,537,816 |
Total shares reserved for future issuance | 2,709,651 | 3,064,883 |
Possible future share issuance authorized under equity incentive plan restricted stock | 200,000 |  |
Stock-based compensation expense | $ 8,000 | $ 6,984 | $ 7,552
Total unrecognized stock-based compensation costs | $ 4,100 |  |
Weighted average remaining term of vesting periods (in years) | 2 years |  |
401(k) Savings Plan [Abstract] |  |  |
401(k) employer match percentage | 75.00% |  |
401(k) employer match salary limit percentage | 6.00% |  |
401(k) employer contribution | $ 1,400 | 1,400 | 1,400
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 |  |
Retirement plan immediate vesting percentage | 100.00% |  |
Deferred Compensation [Abstract] |  |  |
Marketable securities of non-qualified deferred compensation plan fair value disclosure | $ 2,295 | 2,294 |
Non Qualified Deferred Compensation Obligation Fair Value Disclosure [Roll Forward] |  |  |
Beginning deferred compensation liability | 2,294 | 2,564 | 2,866
Mark to market adjustment to deferred compensation (in general and administrative expenses) | 575 | 243 | (302)
Distributions from deferred compensation plans | (574) | (513) | 0
Ending deferred compensation liability | $ 2,295 | $ 2,294 | $ 2,564
Employee Stock Purchase Plan [Abstract] |  |  |
Employee stock purchase plan salary limit percentage | 25.00% |  |
Employee stock purchase plan market percentage | 85.00% |  |
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 | 51,711 | 77,086 | 46,656
Discount percentage on newly issues shares | 15.00% |  |
Discount on newly issued shares expensed as additional compensation | $ 200 | $ 300 | $ 200
Minimum [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Officer cash bonus target | 35.00% |  |
Officer cash bonus performance factor | 0.00% |  |
Non officer management cash bonus target | 5.00% |  |
Maximum [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Officer cash bonus target | 140.00% |  |
Officer cash bonus performance factor | 200.00% |  |
Non officer management cash bonus target | 20.00% |  |
2020 Plan [Member] |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Forfeited (in shares) |  | 0 |
2019 Plan [Member] |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Forfeited (in shares) |  |  | (20,995)
Stock Options [Member] |  |  |
Stock Option Activity Rollforward [Abstract] |  |  |
Balance of options outstanding (in shares) | 512,067 |  |
Options expired (in shares) | (59,776) |  |
Balance of options outstanding (in shares) | 452,291 | 512,067 |
Options forfeited (in shares) |  | 0 | 0
Options exercised (in shares) | 0 | 0 | 0
Stock Option Activity, Weighted Average Exercise Price Rollforward [Abstract] |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 46.18 |  |
Options expired, weighted average exercise price (in dollars per share) | 37.71 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 47.30 | $ 46.18 |
Options exercisable (in shares) | 452,291 |  |
Weighted average exercise price (in dollars per share) | $ 47.30 |  |
Weighted average remaining life (in years) | 1 year 3 months 18 days |  |
2014 to 2017 Stock Options [Member] |  |  |
Retirement Benefits [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 |  |
Time-Based Restricted Stock [Member] |  |  |
Retirement Benefits [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 (in shares) | 276,308 | 217,833 | 219,719
Awarded and issued (in shares) | 181,540 | 155,717 | 99,975
Vested (in shares) | (114,233) | (95,423) | (101,082)
Forfeited (in shares) |  | (1,819) | (779)
Balance of restricted stock outstanding (in shares) | 343,615 | 276,308 | 217,833
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 33.51 | $ 43.00 | $ 42.63
Awarded and issued, weighted average grant date fair value (in dollars per share) | 24.45 | 26.42 | 43.58
Vested, weighted average grant date fair value (in dollars per share) | 34.79 | 43.57 | 42.80
Forfeited, weighted average grant date fair value (in dollars per share) |  | 34.11 | 42.37
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 28.30 | $ 33.51 | $ 43.00
Fair value at grant date of restricted stock issued | $ 4,400 | $ 4,100 | $ 4,400
Vesting date fair value of restricted stock | $ 2,800 | $ 2,500 | $ 4,400
Grant date fair value of restricted stock (in dollars per share) | $ 24.45 | $ 26.42 | $ 43.58
Total Return-Based Restricted Stock [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 3 years |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Balance of restricted stock outstanding (in shares) | 286,592 | 227,144 | 229,292
Awarded and issued (in shares) | 142,992 | 126,736 | 81,832
Vested (in shares) | (79,588) | (65,140) | (62,985)
Forfeited (in shares) |  | (2,148) | (20,995)
Balance of restricted stock outstanding (in shares) | 349,996 | 286,592 | 227,144
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 34.03 | $ 38.93 | $ 38.00
Awarded and issued, weighted average grant date fair value (in dollars per share) | 25.22 | 27.06 | 41.94
Vested, weighted average grant date fair value (in dollars per share) | 39.98 | 44.88 | 45.90
Forfeited, weighted average grant date fair value (in dollars per share) |  | 35.83 | 45.90
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 29.80 | $ 34.03 | $ 38.93
Fair value at grant date of restricted stock issued | $ 3,600 | $ 3,400 | $ 3,400
Vesting date fair value of restricted stock | $ 1,900 | $ 1,700 | $ 2,700
Company total return, total return-based restricted stock | 100.00% |  |
Vesting percentage, total return-based restricted stock | 100.00% |  |
Grant date fair value of restricted stock (in dollars per share) | $ 25.22 | $ 27.06 | $ 41.94
Assumptions Used in Determining Fair Values of Restricted Stock Granted: |  |  |
Risk free interest rate | 4.30% | 4.40% | 1.60%
Common stock dividend yield | 8.70% | 6.90% | 4.50%
Expected volatility rate | 29.30% | 27.20% | 25.80%
Dividends paid for previous year | 1 year |  |
Period preceding date of grant | 3 months |  |
Total Return-Based Restricted Stock [Member] | Minimum [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Percentage of return-based restricted stock issued to officers that will vest | 0.00% |  |
Total Return-Based Restricted Stock [Member] | Maximum [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Percentage of return-based restricted stock issued to officers that will vest | 150.00% |  |
Total Return-Based Restricted Stock Current Year Issuance [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Awarded and issued, weighted average grant date fair value (in dollars per share) | $ 25.22 | $ 27.06 | $ 41.94
Grant date fair value of restricted stock (in dollars per share) | $ 25.22 | $ 27.06 | $ 41.94

X
- Definition Percentage of post 2009 grants deemed fully vested at the grant date. + References No definition available. + Details
Name: | hiw_A2009AndPriorRetirementPlanImmediateVestingPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of employer contribution to the 401(k) Savings Plan. + References No definition available. + Details
Name: | hiw_A401KEmployerContribution
Namespace Prefix: | hiw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The employer match percentage related to the 401k policy. + References No definition available. + Details
Name: | hiw_A401KEmployerMatchPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The employer match salary limit percentage related to the 401(k) policy. + References No definition available. + Details
Name: | hiw_A401KEmployerMatchSalaryLimitPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 401(k) Savings Plan [Abstract] + References No definition available. + Details
Name: | hiw_A401KSavingsPlanAbstract
Namespace Prefix: | hiw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation [Abstract] + References No definition available. + Details
Name: | hiw_DeferredCompensationAbstract
Namespace Prefix: | hiw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee Stock Purchase Plan [Abstract] + References No definition available. + Details
Name: | hiw_EmployeeStockPurchasePlanAbstract
Namespace Prefix: | hiw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The employee stock purchase plan market percentage related to the employee stock purchase plan policy. + References No definition available. + Details
Name: | hiw_EmployeeStockPurchasePlanMarketPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The employee stock purchase plan market percentage discount related to the employee stock purchase plan policy. + References No definition available. + Details
Name: | hiw_EmployeeStockPurchasePlanMarketPercentageDiscount
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The employee stock purchase plan salary limit percentage related to the employee stock purchase plan policy. + References No definition available. + Details
Name: | hiw_EmployeeStockPurchasePlanSalaryLimitPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents assets held under deferred compensation agreements. + References No definition available. + Details
Name: | hiw_MarketableSecuritiesOfNonQualifiedDeferredCompensationPlanFairValueDisclosure
Namespace Prefix: | hiw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
Name: | hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosure
Namespace Prefix: | hiw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
Name: | hiw_NonQualifiedDeferredCompensationObligationFairValueDisclosureRollForward
Namespace Prefix: | hiw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days at the end of the quarterused to calculate Employe Stock Purchase Plan discount. + References No definition available. + Details
Name: | hiw_NumberOfDaysAtEndOfQuarterUsedToCalculateEmployeeStockPurchasePlanDiscount
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of share based compensation shares outstanding under stock option plans. + References No definition available. + Details
Name: | hiw_NumberOfOutstandingOptionsAndWarrants
Namespace Prefix: | hiw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage for officers' cash bonus performance factor. + References No definition available. + Details
Name: | hiw_OfficerCashBonusPerformanceFactor
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage for officers' target annual non-equity incentive payment. + References No definition available. + Details
Name: | hiw_OfficerCashBonusTarget
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage for other management annual non-equity incentive payment. + References No definition available. + Details
Name: | hiw_OfficerManagementCashBonusTarget
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent that shares of performance-based restricted stock can vest should actual performance equal or exceed threshold performance goals. + References No definition available. + Details
Name: | hiw_PerformancePlanFactor
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time preceding date of grant during which the dividend yield is calculated. + References No definition available. + Details
Name: | hiw_PeriodOfTimePrecedingDateOfGrantToCalculateDividendYield
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of possible future issuances under equity incentive plans. + References No definition available. + Details
Name: | hiw_PossibleFutureShareIssuanceAuthorizedUnderEquityIncentivePlan
Namespace Prefix: | hiw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum amount of possible future issuances of restricted stock under equity incentive plans. + References No definition available. + Details
Name: | hiw_PossibleFutureShareIssuanceAuthorizedUnderEquityIncentivePlanRestrictedStock
Namespace Prefix: | hiw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The previous number of years on which the dividend yield is calculated. + References No definition available. + Details
Name: | hiw_PreviousNumberOfYearsOnWhichDivdendYieldIsCalculated
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Retirement Plan [Abstract] + References No definition available. + Details
Name: | hiw_RetirementPlanAbstract
Namespace Prefix: | hiw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Age required to qualify for the entity's retirement plan. + References No definition available. + Details
Name: | hiw_RetirementPlanQualificationAge
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of minimum continuous years of service required to qualify for the entity's retirement plan after the age of 55. + References No definition available. + Details
Name: | hiw_RetirementPlanQualificationMinimumYearsOfService
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of continuous years of service required to qualify for the entity's retirement plan. + References No definition available. + Details
Name: | hiw_RetirementPlanQualificationYearsOfService
Namespace Prefix: | hiw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total fair value of equity-based awards granted during the reporting period. + References No definition available. + Details
Name: | hiw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue
Namespace Prefix: | hiw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum percentage by which company total return must exceed the peer group total return index to achieve vesting of total return-based restricted stock. + References No definition available. + Details
Name: | hiw_TotalReturnbasedRestrictedStockMinimumCompanyTotalReturnPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of total return-based restricted stock that vests if company total return exceeds 100% of the peer group total return index. + References No definition available. + Details
Name: | hiw_TotalReturnbasedRestrictedStockVestingPercentage
Namespace Prefix: | hiw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increases (decreases) in the market value of unsold securities whose gains (losses) are included in income. + References No definition available. + Details
Name: | hiw_UnrealizedGainLossMarketableSecuritiesDeferredCompensation
Namespace Prefix: | hiw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in additional paid-in capital (APIC) for recognition of cost for employee stock purchase program (ESPP) award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of distribution made to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period from grant date that an equity-based award expires, 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/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=hiw_A2020PlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=hiw_A2019PlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hiw_A2014to2017StockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hiw_TimeBasedRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hiw_TotalReturnBasedAndPerformanceBasedRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hiw_TotalReturnBasedRestrictedStockCurrentYearIssuanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |