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Notes Payable and Unsecured Credit Facilities - Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 3,718,944 | $ 3,923,084
Fixed Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date |  | Mar. 01, 2032 |
Debt, Weighted Average Contractual Interest Rate |  | 4.00% |
Debt, Weighted Average Effective Interest Rate |  | 3.80% |
Long-term Debt |  | $ 359,414 | 272,750
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date |  | Mar. 15, 2049 |
Debt, Weighted Average Contractual Interest Rate |  | 3.80% |
Debt, Weighted Average Effective Interest Rate |  | 4.00% |
Long-term Debt |  | $ 3,243,991 | 3,239,609
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 3,718,944 | 3,658,405
Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date | [1] | Mar. 23, 2025 |
Debt, Weighted Average Contractual Interest Rate | [1] | 1.00% |
Debt, Weighted Average Effective Interest Rate | [1] | 1.30% |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Contractual Interest Rate | [2] | 2.00% |
Debt, Weighted Average Effective Interest Rate | [2] | 2.10% |
Term Loan [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total credit facilities | [2] |  | 264,679
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date | [3] | Jun. 02, 2027 |
Debt, Weighted Average Contractual Interest Rate | [3] | 3.20% |
Debt, Weighted Average Effective Interest Rate | [3] | 3.30% |
Long-term Debt | [3] | $ 115,539 | $ 146,046
[1] | Weighted average effective rate for the Line is calculated based on a fully drawn Line balance.
[2] | Weighted average contractual and effective rates for the Term Loan are as of December 31, 2020, as the entire balance was repaid during January 2021.
[3] | Consists of five mortgages with interest rates that vary on LIBOR based formulas. Four of these variable rate loans have interest rate swaps in place to mitigate the interest rate fluctuation risk. The effective fixed rates of the loans range from 2.5% to 4.1

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- 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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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