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Deferred Costs and Intangibles, net - Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Amortization of deferred leasing costs, lease intangibles and other | $ 13,916 | $ 14,239 | $ 18,648
Amortization of above market lease intangibles | $ 999 | $ 1,200 | $ 2,553

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- Definition Amortization of Above Market Lease Intangibles + References No definition available. + Details
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Namespace Prefix: | krg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of deferred leasing costs, lease intangibles and other over their estimated remaining economic lives. + References No definition available. + Details
Name: | krg_AmortizationofDeferredLeasingCostsLeaseIntangiblesandOther
Namespace Prefix: | krg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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