XML 99 R85.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Corporate Indebtedness - Additional Information (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2019 | Dec. 31, 2019 USD ($) extension | Dec. 31, 2018 USD ($)
Corporate Indebtedness |  |  |
Outstanding under line of credit facility |  | $ 234,013,000 | $ 492,196,000
Long-term debt |  | $ 2,183,253,000 | 1,961,240,000
Term Loan B, Maturity November 21, 2024 | LIBOR |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) | 6500.00% |  |
Term Loan B, Maturity November 21, 2024 | LIBOR | Minimum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) | 8500.00% |  |
Term Loan B, Maturity November 21, 2024 | LIBOR | Maximum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) | 16500.00% |  |
Revolving credit facility |  |  |
Corporate Indebtedness |  |  |
Facility fee (as a percent) |  | 0.20% |
Outstanding under line of credit facility |  | $ 240,000,000.0 |
Revolving credit facility | Minimum |  |  |
Corporate Indebtedness |  |  |
Facility fee (as a percent) |  | 0.125% |
Revolving credit facility | Maximum |  |  |
Corporate Indebtedness |  |  |
Facility fee (as a percent) |  | 0.30% |
2012 Credit Facility |  |  |
Corporate Indebtedness |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,500,000,000 |
Letters of credit |  | 11,800,000 |
Ability to borrow under line of credit facility |  | 1,300,000,000 |
Line of Credit | Term loan |  |  |
Corporate Indebtedness |  |  |
Long-term debt |  | 1,500,000,000 | 1,500,000,000
Line of Credit | 2012 Credit Facility |  |  |
Corporate Indebtedness |  |  |
Long-term debt |  | 234,000,000.0 | $ 492,200,000
Term loan | Term Loan A, Maturity March 31, 2023 |  |  |
Corporate Indebtedness |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,300,000,000 |
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.10% |
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR | Minimum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 0.90% |
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR | Maximum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.75% |
Term loan | Term Loan B, Maturity November 21, 2024 |  |  |
Corporate Indebtedness |  |  |
Credit facility, maximum borrowing capacity |  | $ 200,000,000.0 |
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.00% |
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR | Minimum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 0.85% |
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR | Maximum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.65% |
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 |  |  |
Corporate Indebtedness |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,500,000,000 |
Number of extensions | extension |  | 2 |
Term of extension |  | 6 months |
Maximum borrowing capacity, optional expansion |  | $ 4,500,000,000 |
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.00% |
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Minimum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 0.825% |
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Maximum |  |  |
Corporate Indebtedness |  |  |
Interest rate added to base rate (as a percent) |  | 1.55% |

X
- Definition Line Of Credit Facility, Number Of Extensions + References No definition available. + Details
Name: | slg_LineOfCreditFacilityNumberOfExtensions
Namespace Prefix: | slg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The expanded maximum borrowing capacity available, which is subject to agreement with the entity. + References No definition available. + Details
Name: | slg_LineOfCreditFacilityOptionalExpansionMaximumBorrowingCapacity
Namespace Prefix: | slg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line Of Credit Facility, Term Of Extension + References No definition available. + Details
Name: | slg_LineOfCreditFacilityTermOfExtension
Namespace Prefix: | slg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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=6876686&loc=d3e534808-122878 Reference 3: 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=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=109500613&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=119400593&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=6876686&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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slg_TermLoanBMaturityNovember212024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slg_CreditFacility2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slg_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=slg_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slg_TermLoanAMaturityMarch312023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slg_RevolvingCreditFacilityMaturityMarch312022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |