3.20.1 html 484 599 1 true 153 0 false 17 false false R1.htm 0001000 - Document - Cover Page Sheet http://www.istarfinancial.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.istarfinancial.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.istarfinancial.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://www.istarfinancial.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.istarfinancial.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss Consolidated Statements of Comprehensive Income (Loss) Statements 5 false false R6.htm 1003001 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) Sheet http://www.istarfinancial.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossParenthetical Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) Statements 6 false false R7.htm 1004000 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.istarfinancial.com/role/ConsolidatedStatementsOfChangesInEquity Consolidated Statements of Changes in Equity Statements 7 false false R8.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.istarfinancial.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 2101100 - Disclosure - Business and Organization Sheet http://www.istarfinancial.com/role/BusinessAndOrganization Business and Organization Notes 9 false false R10.htm 2102100 - Disclosure - Basis of Presentation and Principles of Consolidation Sheet http://www.istarfinancial.com/role/BasisOfPresentationAndPrinciplesOfConsolidation Basis of Presentation and Principles of Consolidation Notes 10 false false R11.htm 2103100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 11 false false R12.htm 2104100 - Disclosure - Real Estate Sheet http://www.istarfinancial.com/role/RealEstate Real Estate Notes 12 false false R13.htm 2105100 - Disclosure - Net Investment in Leases Sheet http://www.istarfinancial.com/role/NetInvestmentInLeases Net Investment in Leases Notes 13 false false R14.htm 2106100 - Disclosure - Land and Development Sheet http://www.istarfinancial.com/role/LandAndDevelopment Land and Development Notes 14 false false R15.htm 2107100 - Disclosure - Loans Receivable and Other Lending Investments, net Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNet Loans Receivable and Other Lending Investments, net Notes 15 false false R16.htm 2108100 - Disclosure - Other Investments Sheet http://www.istarfinancial.com/role/OtherInvestments Other Investments Notes 16 false false R17.htm 2109100 - Disclosure - Other Assets and Other Liabilities Sheet http://www.istarfinancial.com/role/OtherAssetsAndOtherLiabilities Other Assets and Other Liabilities Notes 17 false false R18.htm 2110100 - Disclosure - Loan Participations Payable, net Sheet http://www.istarfinancial.com/role/LoanParticipationsPayableNet Loan Participations Payable, net Notes 18 false false R19.htm 2111100 - Disclosure - Debt Obligations, net Sheet http://www.istarfinancial.com/role/DebtObligationsNet Debt Obligations, net Notes 19 false false R20.htm 2112100 - Disclosure - Commitments and Contingencies Sheet http://www.istarfinancial.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 20 false false R21.htm 2113100 - Disclosure - Derivatives Sheet http://www.istarfinancial.com/role/Derivatives Derivatives Notes 21 false false R22.htm 2114100 - Disclosure - Equity Sheet http://www.istarfinancial.com/role/Equity Equity Notes 22 false false R23.htm 2115100 - Disclosure - Stock-Based Compensation Plans and Employee Benefits Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefits Stock-Based Compensation Plans and Employee Benefits Notes 23 false false R24.htm 2116100 - Disclosure - Earnings Per Share Sheet http://www.istarfinancial.com/role/EarningsPerShare Earnings Per Share Notes 24 false false R25.htm 2117100 - Disclosure - Fair Values Sheet http://www.istarfinancial.com/role/FairValues Fair Values Notes 25 false false R26.htm 2118100 - Disclosure - Segment Reporting Sheet http://www.istarfinancial.com/role/SegmentReporting Segment Reporting Notes 26 false false R27.htm 2119100 - Disclosure - Subsequent Events Sheet http://www.istarfinancial.com/role/SubsequentEvents Subsequent Events Notes 27 false false R28.htm 2203201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPolicies 28 false false R29.htm 2302301 - Disclosure - Basis of Presentation and Principles of Consolidation (Tables) Sheet http://www.istarfinancial.com/role/BasisOfPresentationAndPrinciplesOfConsolidationTables Basis of Presentation and Principles of Consolidation (Tables) Tables http://www.istarfinancial.com/role/BasisOfPresentationAndPrinciplesOfConsolidation 29 false false R30.htm 2303302 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPolicies 30 false false R31.htm 2304301 - Disclosure - Real Estate (Tables) Sheet http://www.istarfinancial.com/role/RealEstateTables Real Estate (Tables) Tables http://www.istarfinancial.com/role/RealEstate 31 false false R32.htm 2305301 - Disclosure - Net Investment in Leases (Tables) Sheet http://www.istarfinancial.com/role/NetInvestmentInLeasesTables Net Investment in Leases (Tables) Tables http://www.istarfinancial.com/role/NetInvestmentInLeases 32 false false R33.htm 2306301 - Disclosure - Land and Development (Tables) Sheet http://www.istarfinancial.com/role/LandAndDevelopmentTables Land and Development (Tables) Tables http://www.istarfinancial.com/role/LandAndDevelopment 33 false false R34.htm 2307301 - Disclosure - Loans Receivable and Other Lending Investments, net (Tables) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetTables Loans Receivable and Other Lending Investments, net (Tables) Tables http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNet 34 false false R35.htm 2308301 - Disclosure - Other Investments (Tables) Sheet http://www.istarfinancial.com/role/OtherInvestmentsTables Other Investments (Tables) Tables http://www.istarfinancial.com/role/OtherInvestments 35 false false R36.htm 2309301 - Disclosure - Other Assets and Other Liabilities (Tables) Sheet http://www.istarfinancial.com/role/OtherAssetsAndOtherLiabilitiesTables Other Assets and Other Liabilities (Tables) Tables http://www.istarfinancial.com/role/OtherAssetsAndOtherLiabilities 36 false false R37.htm 2310301 - Disclosure - Loan Participations Payable, net (Tables) Sheet http://www.istarfinancial.com/role/LoanParticipationsPayableNetTables Loan Participations Payable, net (Tables) Tables http://www.istarfinancial.com/role/LoanParticipationsPayableNet 37 false false R38.htm 2311301 - Disclosure - Debt Obligations, net (Tables) Sheet http://www.istarfinancial.com/role/DebtObligationsNetTables Debt Obligations, net (Tables) Tables http://www.istarfinancial.com/role/DebtObligationsNet 38 false false R39.htm 2312301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.istarfinancial.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://www.istarfinancial.com/role/CommitmentsAndContingencies 39 false false R40.htm 2313301 - Disclosure - Derivatives (Tables) Sheet http://www.istarfinancial.com/role/DerivativesTables Derivatives (Tables) Tables http://www.istarfinancial.com/role/Derivatives 40 false false R41.htm 2314301 - Disclosure - Equity (Tables) Sheet http://www.istarfinancial.com/role/EquityTables Equity (Tables) Tables http://www.istarfinancial.com/role/Equity 41 false false R42.htm 2315301 - Disclosure - Stock-Based Compensation Plans and Employee Benefits (Tables) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefitsTables Stock-Based Compensation Plans and Employee Benefits (Tables) Tables http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefits 42 false false R43.htm 2316301 - Disclosure - Earnings Per Share (Tables) Sheet http://www.istarfinancial.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.istarfinancial.com/role/EarningsPerShare 43 false false R44.htm 2317301 - Disclosure - Fair Values (Tables) Sheet http://www.istarfinancial.com/role/FairValuesTables Fair Values (Tables) Tables http://www.istarfinancial.com/role/FairValues 44 false false R45.htm 2318301 - Disclosure - Segment Reporting (Tables) Sheet http://www.istarfinancial.com/role/SegmentReportingTables Segment Reporting (Tables) Tables http://www.istarfinancial.com/role/SegmentReporting 45 false false R46.htm 2401401 - Disclosure - Business and Organization (Details) Sheet http://www.istarfinancial.com/role/BusinessAndOrganizationDetails Business and Organization (Details) Details http://www.istarfinancial.com/role/BusinessAndOrganization 46 false false R47.htm 2402402 - Disclosure - Basis of Presentation and Principles of Consolidation (Details) Sheet http://www.istarfinancial.com/role/BasisOfPresentationAndPrinciplesOfConsolidationDetails Basis of Presentation and Principles of Consolidation (Details) Details http://www.istarfinancial.com/role/BasisOfPresentationAndPrinciplesOfConsolidationTables 47 false false R48.htm 2403403 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://www.istarfinancial.com/role/SummaryOfSignificantAccountingPoliciesTables 48 false false R49.htm 2404402 - Disclosure - Real Estate - Schedule of Real Estate Assets (Details) Sheet http://www.istarfinancial.com/role/RealEstateScheduleOfRealEstateAssetsDetails Real Estate - Schedule of Real Estate Assets (Details) Details 49 false false R50.htm 2404403 - Disclosure - Real Estate - Net Lease Venture (Details) Sheet http://www.istarfinancial.com/role/RealEstateNetLeaseVentureDetails Real Estate - Net Lease Venture (Details) Details 50 false false R51.htm 2404404 - Disclosure - Real Estate - Acquisitions (Details) Sheet http://www.istarfinancial.com/role/RealEstateAcquisitionsDetails Real Estate - Acquisitions (Details) Details 51 false false R52.htm 2404405 - Disclosure - Real Estate - Dispositions (Details) Sheet http://www.istarfinancial.com/role/RealEstateDispositionsDetails Real Estate - Dispositions (Details) Details 52 false false R53.htm 2404406 - Disclosure - Real Estate - Real Estate Available and Held for Sale (Details) Sheet http://www.istarfinancial.com/role/RealEstateRealEstateAvailableAndHeldForSaleDetails Real Estate - Real Estate Available and Held for Sale (Details) Details 53 false false R54.htm 2404407 - Disclosure - Real Estate - Impairments (Details) Sheet http://www.istarfinancial.com/role/RealEstateImpairmentsDetails Real Estate - Impairments (Details) Details 54 false false R55.htm 2404408 - Disclosure - Real Estate - Tenant Reimbursements (Details) Sheet http://www.istarfinancial.com/role/RealEstateTenantReimbursementsDetails Real Estate - Tenant Reimbursements (Details) Details 55 false false R56.htm 2404409 - Disclosure - Real Estate - Allowance for Doubtful Accounts (Details) Sheet http://www.istarfinancial.com/role/RealEstateAllowanceForDoubtfulAccountsDetails Real Estate - Allowance for Doubtful Accounts (Details) Details 56 false false R57.htm 2405402 - Disclosure - Net Investment in Leases - Narrative (Details) Sheet http://www.istarfinancial.com/role/NetInvestmentInLeasesNarrativeDetails Net Investment in Leases - Narrative (Details) Details 57 false false R58.htm 2405403 - Disclosure - Net Investment in Leases - Net Investment in Leases (Details) Sheet http://www.istarfinancial.com/role/NetInvestmentInLeasesNetInvestmentInLeasesDetails Net Investment in Leases - Net Investment in Leases (Details) Details 58 false false R59.htm 2405404 - Disclosure - Net Investment in Leases - Future Minimum Lease Payments to be Collected Under Sales-Type Leases (Details) Sheet http://www.istarfinancial.com/role/NetInvestmentInLeasesFutureMinimumLeasePaymentsToBeCollectedUnderSalesTypeLeasesDetails Net Investment in Leases - Future Minimum Lease Payments to be Collected Under Sales-Type Leases (Details) Details 59 false false R60.htm 2405405 - Disclosure - Net Investment in Leases - Allowance for Losses on Net Investment in Leases (Details) Sheet http://www.istarfinancial.com/role/NetInvestmentInLeasesAllowanceForLossesOnNetInvestmentInLeasesDetails Net Investment in Leases - Allowance for Losses on Net Investment in Leases (Details) Details 60 false false R61.htm 2406402 - Disclosure - Land and Development - Schedule of Land and Development Assets (Details) Sheet http://www.istarfinancial.com/role/LandAndDevelopmentScheduleOfLandAndDevelopmentAssetsDetails Land and Development - Schedule of Land and Development Assets (Details) Details 61 false false R62.htm 2406403 - Disclosure - Land and Development - Narrative (Details) Sheet http://www.istarfinancial.com/role/LandAndDevelopmentNarrativeDetails Land and Development - Narrative (Details) Details 62 false false R63.htm 2407402 - Disclosure - Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetScheduleOfLoansReceivableDetails Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) Details 63 false false R64.htm 2407403 - Disclosure - Loans Receivable and Other Lending Investments, net - Allowance for Loan Losses (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetAllowanceForLoanLossesDetails Loans Receivable and Other Lending Investments, net - Allowance for Loan Losses (Details) Details 64 false false R65.htm 2407404 - Disclosure - Loans Receivable and Other Lending Investments, net - Investment in Loans and Associated Allowance for Loan Losses (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetInvestmentInLoansAndAssociatedAllowanceForLoanLossesDetails Loans Receivable and Other Lending Investments, net - Investment in Loans and Associated Allowance for Loan Losses (Details) Details 65 false false R66.htm 2407405 - Disclosure - Loans Receivable and Other Lending Investments, net - Credit Characteristics for Performing Loans (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetCreditCharacteristicsForPerformingLoansDetails Loans Receivable and Other Lending Investments, net - Credit Characteristics for Performing Loans (Details) Details 66 false false R67.htm 2407406 - Disclosure - Loans Receivable and Other Lending Investments, net - Credit Characteristics by Payment Status (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetCreditCharacteristicsByPaymentStatusDetails Loans Receivable and Other Lending Investments, net - Credit Characteristics by Payment Status (Details) Details 67 false false R68.htm 2407407 - Disclosure - Loans Receivable and Other Lending Investments, net - Impaired Loans (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetImpairedLoansDetails Loans Receivable and Other Lending Investments, net - Impaired Loans (Details) Details 68 false false R69.htm 2407408 - Disclosure - Loans Receivable and Other Lending Investments, net - Other Lending Investments (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetOtherLendingInvestmentsDetails Loans Receivable and Other Lending Investments, net - Other Lending Investments (Details) Details 69 false false R70.htm 2407409 - Disclosure - Loans Receivable and Other Lending Investments, net - Maturities (Details) Sheet http://www.istarfinancial.com/role/LoansReceivableAndOtherLendingInvestmentsNetMaturitiesDetails Loans Receivable and Other Lending Investments, net - Maturities (Details) Details 70 false false R71.htm 2408402 - Disclosure - Other Investments - Schedule of Other Investments (Details) Sheet http://www.istarfinancial.com/role/OtherInvestmentsScheduleOfOtherInvestmentsDetails Other Investments - Schedule of Other Investments (Details) Details 71 false false R72.htm 2408403 - Disclosure - Other Investments - Safehold Inc. (Details) Sheet http://www.istarfinancial.com/role/OtherInvestmentsSafeholdIncDetails Other Investments - Safehold Inc. (Details) Details 72 false false R73.htm 2408404 - Disclosure - Other Investments - Net Lease Venture II (Details) Sheet http://www.istarfinancial.com/role/OtherInvestmentsNetLeaseVentureIiDetails Other Investments - Net Lease Venture II (Details) Details 73 false false R74.htm 2408405 - Disclosure - Other Investments - Other Real Estate Equity Investments (Details) Sheet http://www.istarfinancial.com/role/OtherInvestmentsOtherRealEstateEquityInvestmentsDetails Other Investments - Other Real Estate Equity Investments (Details) Details 74 false false R75.htm 2408406 - Disclosure - Other Investments - Summarized Investee Financial Information (Details) Sheet http://www.istarfinancial.com/role/OtherInvestmentsSummarizedInvesteeFinancialInformationDetails Other Investments - Summarized Investee Financial Information (Details) Details 75 false false R76.htm 2409402 - Disclosure - Other Assets and Other Liabilities - Deferred Expenses and Other Assets (Details) Sheet http://www.istarfinancial.com/role/OtherAssetsAndOtherLiabilitiesDeferredExpensesAndOtherAssetsDetails Other Assets and Other Liabilities - Deferred Expenses and Other Assets (Details) Details 76 false false R77.htm 2409403 - Disclosure - Other Assets and Other Liabilities - Accounts Payable, Accrued Expenses and Other Liabilities (Details) Sheet http://www.istarfinancial.com/role/OtherAssetsAndOtherLiabilitiesAccountsPayableAccruedExpensesAndOtherLiabilitiesDetails Other Assets and Other Liabilities - Accounts Payable, Accrued Expenses and Other Liabilities (Details) Details 77 false false R78.htm 2410402 - Disclosure - Loan Participations Payable, net (Details) Sheet http://www.istarfinancial.com/role/LoanParticipationsPayableNetDetails Loan Participations Payable, net (Details) Details http://www.istarfinancial.com/role/LoanParticipationsPayableNetTables 78 false false R79.htm 2411402 - Disclosure - Debt Obligations, net - Schedule of Debt (Details) Sheet http://www.istarfinancial.com/role/DebtObligationsNetScheduleOfDebtDetails Debt Obligations, net - Schedule of Debt (Details) Details 79 false false R80.htm 2411403 - Disclosure - Debt Obligations, net - Future Scheduled Maturities (Details) Sheet http://www.istarfinancial.com/role/DebtObligationsNetFutureScheduledMaturitiesDetails Debt Obligations, net - Future Scheduled Maturities (Details) Details 80 false false R81.htm 2411404 - Disclosure - Debt Obligations, net - Secured Term Loan and Credit Facility Narrative (Details) Sheet http://www.istarfinancial.com/role/DebtObligationsNetSecuredTermLoanAndCreditFacilityNarrativeDetails Debt Obligations, net - Secured Term Loan and Credit Facility Narrative (Details) Details 81 false false R82.htm 2411405 - Disclosure - Debt Obligations, net - Unsecured Notes Narrative (Details) Notes http://www.istarfinancial.com/role/DebtObligationsNetUnsecuredNotesNarrativeDetails Debt Obligations, net - Unsecured Notes Narrative (Details) Details 82 false false R83.htm 2411406 - Disclosure - Debt Obligations, net - Collateral Assets (Details) Sheet http://www.istarfinancial.com/role/DebtObligationsNetCollateralAssetsDetails Debt Obligations, net - Collateral Assets (Details) Details 83 false false R84.htm 2411407 - Disclosure - Debt Obligations, net - Debt Covenants (Details) Sheet http://www.istarfinancial.com/role/DebtObligationsNetDebtCovenantsDetails Debt Obligations, net - Debt Covenants (Details) Details 84 false false R85.htm 2412402 - Disclosure - Commitments and Contingencies - Fundings That May be Required (Details) Sheet http://www.istarfinancial.com/role/CommitmentsAndContingenciesFundingsThatMayBeRequiredDetails Commitments and Contingencies - Fundings That May be Required (Details) Details 85 false false R86.htm 2412403 - Disclosure - Commitments and Contingencies - Other Commitments (Details) Sheet http://www.istarfinancial.com/role/CommitmentsAndContingenciesOtherCommitmentsDetails Commitments and Contingencies - Other Commitments (Details) Details 86 false false R87.htm 2413402 - Disclosure - Derivatives - Classification on the Consolidated Balance Sheets (Details) Sheet http://www.istarfinancial.com/role/DerivativesClassificationOnConsolidatedBalanceSheetsDetails Derivatives - Classification on the Consolidated Balance Sheets (Details) Details 87 false false R88.htm 2413403 - Disclosure - Derivatives - Effect in the Consolidated Statements of Operations and Comprehensive Income (Details) Sheet http://www.istarfinancial.com/role/DerivativesEffectInConsolidatedStatementsOfOperationsAndComprehensiveIncomeDetails Derivatives - Effect in the Consolidated Statements of Operations and Comprehensive Income (Details) Details 88 false false R89.htm 2414402 - Disclosure - Equity - Preferred Stock (Details) Sheet http://www.istarfinancial.com/role/EquityPreferredStockDetails Equity - Preferred Stock (Details) Details 89 false false R90.htm 2414403 - Disclosure - Equity - Dividends (Details) Sheet http://www.istarfinancial.com/role/EquityDividendsDetails Equity - Dividends (Details) Details 90 false false R91.htm 2414404 - Disclosure - Equity - Stock Repurchase Program (Details) Sheet http://www.istarfinancial.com/role/EquityStockRepurchaseProgramDetails Equity - Stock Repurchase Program (Details) Details 91 false false R92.htm 2414405 - Disclosure - Equity - Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.istarfinancial.com/role/EquityAccumulatedOtherComprehensiveIncomeLossDetails Equity - Accumulated Other Comprehensive Income (Loss) (Details) Details 92 false false R93.htm 2415402 - Disclosure - Stock-Based Compensation Plans and Employee Benefits - Stock-Based Compensation and Long-Term Incentive Plan (Details) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefitsStockBasedCompensationAndLongTermIncentivePlanDetails Stock-Based Compensation Plans and Employee Benefits - Stock-Based Compensation and Long-Term Incentive Plan (Details) Details 93 false false R94.htm 2415403 - Disclosure - Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefitsPerformanceIncentivePlansDetails Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) Details 94 false false R95.htm 2415404 - Disclosure - Stock-Based Compensation Plans and Employee Benefits - Restricted Stock Unit Activity (Details) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefitsRestrictedStockUnitActivityDetails Stock-Based Compensation Plans and Employee Benefits - Restricted Stock Unit Activity (Details) Details 95 false false R96.htm 2415405 - Disclosure - Stock-Based Compensation Plans and Employee Benefits - Directors' Awards (Details) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefitsDirectorsAwardsDetails Stock-Based Compensation Plans and Employee Benefits - Directors' Awards (Details) Details 96 false false R97.htm 2415406 - Disclosure - Stock-Based Compensation Plans and Employee Benefits - 401(k) Plan (Details) Sheet http://www.istarfinancial.com/role/StockBasedCompensationPlansAndEmployeeBenefits401KPlanDetails Stock-Based Compensation Plans and Employee Benefits - 401(k) Plan (Details) Details 97 false false R98.htm 2416402 - Disclosure - Earnings Per Share - Schedule of Earnings Per Share (Details) Sheet http://www.istarfinancial.com/role/EarningsPerShareScheduleOfEarningsPerShareDetails Earnings Per Share - Schedule of Earnings Per Share (Details) Details 98 false false R99.htm 2416403 - Disclosure - Earnings Per Share - Earnings Allocable to Common Shares (Details) Sheet http://www.istarfinancial.com/role/EarningsPerShareEarningsAllocableToCommonSharesDetails Earnings Per Share - Earnings Allocable to Common Shares (Details) Details 99 false false R100.htm 2416404 - Disclosure - Earnings Per Share - Antidilutive Securities (Details) Sheet http://www.istarfinancial.com/role/EarningsPerShareAntidilutiveSecuritiesDetails Earnings Per Share - Antidilutive Securities (Details) Details 100 false false R101.htm 2417402 - Disclosure - Fair Values - Schedule of Fair Value Measurement (Details) Sheet http://www.istarfinancial.com/role/FairValuesScheduleOfFairValueMeasurementDetails Fair Values - Schedule of Fair Value Measurement (Details) Details 101 false false R102.htm 2417403 - Disclosure - Fair Values - Summary of Changes in Level 3 Assets (Details) Sheet http://www.istarfinancial.com/role/FairValuesSummaryOfChangesInLevel3AssetsDetails Fair Values - Summary of Changes in Level 3 Assets (Details) Details 102 false false R103.htm 2417404 - Disclosure - Fair Values - Fair Values of Financial Instruments (Details) Sheet http://www.istarfinancial.com/role/FairValuesFairValuesOfFinancialInstrumentsDetails Fair Values - Fair Values of Financial Instruments (Details) Details 103 false false R104.htm 2418402 - Disclosure - Segment Reporting - Schedule of Segments (Details) Sheet http://www.istarfinancial.com/role/SegmentReportingScheduleOfSegmentsDetails Segment Reporting - Schedule of Segments (Details) Details 104 false false R105.htm 2418403 - Disclosure - Segment Reporting - Reconciliation of Segment Profit to Net Income (Loss) (Details) Sheet http://www.istarfinancial.com/role/SegmentReportingReconciliationOfSegmentProfitToNetIncomeLossDetails Segment Reporting - Reconciliation of Segment Profit to Net Income (Loss) (Details) Details 105 false false R9999.htm Uncategorized Items - star-0331202010q.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - star-0331202010q.htm Cover 106 false false All Reports Book All Reports star-0331202010q.htm star-03312020xex310.htm star-03312020xex320.htm star-20200331.xsd star-20200331_cal.xml star-20200331_def.xml star-20200331_lab.xml star-20200331_pre.xml http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2019-01-31 http://fasb.org/us-gaap/2019-01-31 true true