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Unsecured Line of Credit Payable - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 27, 2021 USD ($) | Aug. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) extension_option | Sep. 30, 2020 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Mar. 29, 2018 USD ($) | Jul. 22, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (12,727,000) | $ 0 |  | $ (12,727,000) | $ 262,000 |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  |  | $ 100,000,000
Credit Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit agreement, aggregate maximum borrowing capacity including accordion feature |  |  | 1,500,000,000 |  |  | 1,500,000,000 |  |  |  |
2016 Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | 150,000,000
2018 Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 250,000,000 |
2018 Term Loan A | Interest rate swaps |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount | $ 150,000,000 |  | 100,000,000 |  |  | 100,000,000 |  | $ 150,000,000 | 150,000,000 |
2018 Term Loan B |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | 100,000,000 |
2018 Term Loan B | Interest rate swaps |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount | 100,000,000 |  | 50,000,000 |  |  | 50,000,000 |  |  | $ 100,000,000 |
Term loan | 2016 Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | $ 150,000,000
Term loan | 2018 Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | 250,000,000 |  |  | $ 250,000,000 |  |  |  |
Term loan | 2018 Term Loan | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 0.85% |  |  |  |
Term loan | 2018 Term Loan | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 1.75% |  |  |  |
Term loan | 2018 Term Loan | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 0.00% |  |  |  |
Term loan | 2018 Term Loan | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 0.75% |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (12,300,000) |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility borrowing capacity |  |  | $ 700,000,000 |  |  | $ 700,000,000 |  |  |  |
Debt instrument term (in years) |  |  | 4 years |  |  |  |  |  |  |
Number of extensions allowed | extension_option |  |  | 2 |  |  |  |  |  |  |
Term of allowable extension (in months) |  |  | 6 months |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (200,000) |  |  |  |  |  |  |
Additional loan origination costs |  |  | $ 4,800,000 |  |  | $ 4,800,000 |  |  |  |
Facility fee (percent) |  |  |  |  |  | 0.20% |  |  |  |
One-month LIBOR (percent) |  |  | 0.08% |  |  | 0.08% |  |  |  |
Repayment of outstanding borrowings | 150,000,000 |  |  |  | $ 100,000,000 | $ 150,000,000 |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Facility fee (percent) |  |  | 0.10% |  |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Facility fee (percent) |  |  | 0.30% |  |  |  |  |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 0.85% |  |  |  |
Base rate component, spread on variable rate (percent) |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.70% |  |  |  |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.40% |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.00% |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.40% |  |  |  |  |  |  |
Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate component, spread on variable rate (percent) |  |  | 0.50% |  |  |  |  |  |  |
Revolving Credit Facility | Term loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (300,000) |  |  |  |  |  |  |  |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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