v3.21.2

Commitments and Contingencies (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Summary of Tenant Improvement Allowances Included in Accounts Payable and Other Liabilities | The Company has a commitment to fund a building expansion expected to be completed in 2022, totaling $17,388 as of September 30, 2021, in exchange for an increase in rent contractually scheduled to commence in August 2022.
Summary of Total Lease Costs Associated with Operating Leases | The following table summarizes the total lease costs associated with operating leases:
|  |  |  | For the Three Months Ended September 30, |  |  | For the Nine Months Ended September 30, |
(in thousands) |  | Financial Statement Presentation |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Operating lease costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office leases |  | General and administrative |  | $ | 158 |  |  | $ | 155 |  |  | $ | 473 |  |  | $ | 362 |
Ground leases |  | Property and operating expense |  |  | 39 |  |  |  | 33 |  |  |  | 106 |  |  |  | 100 |
Variable lease costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ground leases |  | Property and operating expense |  |  | 14 |  |  |  | 13 |  |  |  | 42 |  |  |  | 43 |
Total lease costs |  |  |  | $ | 211 |  |  | $ | 201 |  |  | $ | 621 |  |  | $ | 505 |
Summary of Payments Associated with Obligations Under Operating Leases | The following table summarizes payments associated with obligations under operating leases, reported as Net cash provided by operating activities on the accompanying Condensed Consolidated Statements of Cash Flows:
|  | For the Three Months Ended September 30, |  |  | For the Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Operating lease payments |  | $ | 191 |  |  | $ | 179 |  |  | $ | 618 |  |  | $ | 490 |
Summary of Estimated Future Lease Payments Required Under Non-cancelable Operating Leases as well as Reconciliation to Lease Liabilities | Estimated future lease payments required under non-cancelable operating leases at September 30, 2021, and a reconciliation to the lease liabilities, is as follows:
(in thousands) |  |  |
Remainder of 2021 |  | $ | 186 |
2022 |  |  | 723 |
2023 |  |  | 539 |
2024 |  |  | 153 |
2025 |  |  | 155 |
Thereafter |  |  | 3,777 |
Total undiscounted cash flows |  |  | 5,533 |
Less imputed interest |  |  | (2,819 | )
Lease liabilities |  | $ | 2,714 |

X
- Definition Leases payments associated with obligations under operating lases related to net cash provided by operating activities. + References No definition available. + Details
Name: | bnl_LeasesPaymentsAssociatedWithObligationsUnderOperatingLasesRelatedToNetCashProvidedByOperatingActivitiesTableTextBlock
Namespace Prefix: | bnl_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of tenant improvement allowances. + References No definition available. + Details
Name: | bnl_ScheduleOfTenantImprovementAllowancesTableTextBlock
Namespace Prefix: | bnl_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
Name: | us-gaap_LeaseCostTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123406913&loc=d3e41502-112717 + Details
Name: | us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration