Debt - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal Balance	$ 1,106,455	$ 932,581
Total notes payable	1,103,996	930,808
Senior Notes
Debt Instrument [Line Items]
Principal Balance	$ 535,000	$ 535,000
Weighted Average Interest Rate	4.20%	4.20%
Unamortized deferred financing costs	$ (1,898)	$ (1,460)
Total notes payable	533,102	533,540
Senior Notes \| Senior Unsecured Notes 3.75% Due 2021
Debt Instrument [Line Items]
Principal Balance	$ 37,000	$ 37,000
Interest Rate	3.75%	3.75%
Senior Notes \| Senior Unsecured Notes 4.12% Due 2023
Debt Instrument [Line Items]
Principal Balance	$ 41,500	$ 41,500
Interest Rate	4.12%	4.12%
Senior Notes \| Senior Unsecured Notes 4.65% Due 2024
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	4.65%	4.65%
Senior Notes \| Senior Unsecured Notes 4.05% Due 2024
Debt Instrument [Line Items]
Principal Balance	$ 25,000	$ 25,000
Interest Rate	4.05%	4.05%
Senior Notes \| Senior Unsecured Notes 4.27% Due 2025
Debt Instrument [Line Items]
Principal Balance	$ 31,500	$ 31,500
Interest Rate	4.27%	4.27%
Senior Notes \| Senior Unsecured Notes 4.20% Due 2025
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	4.20%	4.20%
Senior Notes \| Senior Unsecured Notes 4.09% Due 2025
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	4.09%	4.09%
Senior Notes \| Senior Unsecured Notes 4.74% Due 2026
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	4.74%	4.74%
Senior Notes \| Senior Unsecured Notes 4.28% Due 2026
Debt Instrument [Line Items]
Principal Balance	$ 25,000	$ 25,000
Interest Rate	4.28%	4.28%
Senior Notes \| Senior Unsecured Notes 4.57% Due 2027
Debt Instrument [Line Items]
Principal Balance	$ 30,000	$ 30,000
Interest Rate	4.57%	4.57%
Senior Notes \| Senior Unsecured Notes 3.64% Due 2028
Debt Instrument [Line Items]
Principal Balance	$ 75,000	$ 75,000
Interest Rate	3.64%	3.64%
Senior Notes \| Senior Unsecured Notes 4.72% Due 2029
Debt Instrument [Line Items]
Principal Balance	$ 20,000	$ 20,000
Interest Rate	4.72%	4.72%
Senior Notes \| Senior Unsecured Notes 4.15% Due 2019
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	4.15%	4.15%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes3.75Due2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.12Due2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.65Due2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.05Due2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.27Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.20Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.09Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.74Due2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.28Due2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.57Due2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes3.64Due2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes4.72Due2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rpt_SeniorUnsecuredNotes415Due2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: