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v3.20.4

Unsecured Debt - Summary (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) line_of_credit | Dec. 31, 2019 USD ($) | Nov. 30, 2016 USD ($) | Oct. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 5,607,985,000 | $ 4,763,206,000 |  |
Lines of credit | 0 | 55,000,000 |  |
Total unsecured debt | 5,607,985,000 | 4,818,206,000 |  |
Unamortized debt issuance expense | $ 1,800,000 | 2,600,000 |  |
Number of outstanding lines of credit | line_of_credit | 2 |  |  |
Unsecured bonds private placement - fixed rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 199,950,000 | 199,820,000 |  |
Weighted Average Maturity In Years | 6 months |  |  |
Term loan - variable rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 550,000,000.0 | $ 350,000,000.0 | $ 350,000,000.0 | $ 225,000,000.0
Weighted average interest rate | 1.70% | 2.70% |  |
Weighted Average Maturity In Years | 1 year 6 months |  |  |
Term loan - variable rate | Carrying Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 549,380,000 | $ 349,189,000 |  |
Bonds public offering - fixed rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 4,858,655,000 | $ 4,214,197,000 |  |
Weighted average interest rate | 3.40% | 3.80% |  |
Weighted Average Maturity In Years | 9 years 4 months 24 days |  |  |
Unsecured Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Lines of credit | $ 0 | $ 55,000,000 |  |
Weighted average interest rate | 1.00% | 2.50% |  |
Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, unamortized premium | $ 10,100,000 | $ 12,200,000 |  |
Unamortized debt issuance expense | 31,900,000 | 24,500,000 |  |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 1,240,000,000 |  |  |
Unsecured Line of Credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Lines of credit | 0 | 55,000,000.0 |  |
Unamortized debt issuance expense | 3,700,000 | $ 3,800,000 |  |
Maximum borrowing capacity | $ 1,200,000,000 |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer) and 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 No definition available. + Details
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