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v3.22.1

Debt - Summary (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) extention | Apr. 18, 2023 | Apr. 01, 2022 | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 2,313,397 |  |  | $ 2,225,983
Unamortized debt issuance costs | (7,088) |  |  | (7,585)
Debt Instrument, Unamortized Discount (Premium), Net | (136) |  |  | (136)
Principal outstanding | $ 2,306,173 |  |  | 2,218,262
Weighted average interest rate | 2.87% |  |  |
Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed Interest Rate (as a percent) |  |  | 1.30% |
Interest Rate Swaps |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative notional amount swapped | $ 975,000 |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 0.452% |  |  |
Term Loan | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.85% |  |  |
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal outstanding | $ 384,000 |  |  | 296,000
Debt Instrument, Maturity Date | Oct. 23, 2026 |  |  |
Maximum borrowing capacity | $ 750,000 |  |  |
Number Of Extensions | extention | 2 |  |  |
Debt Instrument Term Extension Period | 6 months |  |  |
Unsecured Credit Facility | Prepaid Expenses and Other Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance costs | $ (4,900) |  |  | (5,200)
Unsecured Credit Facility | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.775% |  |  |
Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 975,000 |  |  | 975,000
Unamortized debt issuance costs | (4,075) |  |  | (4,423)
Principal outstanding | 970,925 |  |  | 970,577
Unsecured Term Loans | $150 Million Wells Fargo Unsecured Term Loan A |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 150,000 |  |  | 150,000
Debt Instrument, Interest Rate, Effective Percentage | 3.23% |  |  |
Debt Instrument, Maturity Date | Mar. 15, 2027 |  |  |
Fixed Interest Rate (as a percent) | 2.38% |  |  |
Unsecured Term Loans | $150 Million Unsecured Term Loan D [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 150,000 |  |  | 150,000
Debt Instrument, Interest Rate, Effective Percentage | 2.85% |  |  |
Debt Instrument, Maturity Date | Jan. 04, 2023 |  |  |
Fixed Interest Rate (as a percent) | 1.85% |  |  |
Unsecured Term Loans | $175 Million Unsecured Term Loan E [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 175,000 |  |  | 175,000
Debt Instrument, Interest Rate, Effective Percentage | 3.77% |  |  |
Debt Instrument, Maturity Date | Jan. 15, 2024 |  |  |
Fixed Interest Rate (as a percent) | 2.92% |  |  |
Unsecured Term Loans | $200 Million Unsecured Term Loan F [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 200,000 |  |  | 200,000
Debt Instrument, Interest Rate, Effective Percentage | 2.96% |  |  |
Debt Instrument, Maturity Date | Jan. 12, 2025 |  |  |
Fixed Interest Rate (as a percent) | 2.11% |  |  |
Unsecured Term Loans | $300 Million Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 300,000 |  |  | 300,000
Debt Instrument, Interest Rate, Effective Percentage | 1.13% |  |  |
Debt Instrument, Maturity Date | Feb. 05, 2026 |  |  |
Fixed Interest Rate (as a percent) | 0.28% |  |  |
Unsecured Term Loans | $300 Million Unsecured Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed Interest Rate (as a percent) |  | 0.94% |  |
Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 900,000 |  |  | 900,000
Unamortized debt issuance costs | (2,942) |  |  | (3,059)
Principal outstanding | 897,058 |  |  | 896,941
Unsecured Notes | $100 Million Series F Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 100,000 |  |  | 100,000
Stated interest rate | 3.98% |  |  |
Debt Instrument, Maturity Date | Jan. 05, 2023 |  |  |
Unsecured Notes | $50 Million Series A Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 50,000 |  |  | 50,000
Stated interest rate | 4.98% |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2024 |  |  |
Unsecured Notes | $100 Million Series D Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 100,000 |  |  | 100,000
Stated interest rate | 4.32% |  |  |
Debt Instrument, Maturity Date | Feb. 20, 2025 |  |  |
Unsecured Notes | $75 Million Series G Unsecured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 75,000 |  |  | 75,000
Stated interest rate | 4.10% |  |  |
Debt Instrument, Maturity Date | Jun. 13, 2025 |  |  |
Unsecured Notes | $50 Million Series B Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 50,000 |  |  | 50,000
Stated interest rate | 4.98% |  |  |
Debt Instrument, Maturity Date | Jul. 01, 2026 |  |  |
Unsecured Notes | $80 Million Series C Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 80,000 |  |  | 80,000
Stated interest rate | 4.42% |  |  |
Debt Instrument, Maturity Date | Dec. 30, 2026 |  |  |
Unsecured Notes | $20 Million Series E Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 20,000 |  |  | 20,000
Stated interest rate | 4.42% |  |  |
Debt Instrument, Maturity Date | Feb. 20, 2027 |  |  |
Unsecured Notes | $100 Million Series H Unsecured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 100,000 |  |  | 100,000
Stated interest rate | 4.27% |  |  |
Debt Instrument, Maturity Date | Jun. 13, 2028 |  |  |
Unsecured Notes | $275 Million Series I Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 275,000 |  |  | 275,000
Stated interest rate | 2.80% |  |  |
Debt Instrument, Maturity Date | Sep. 29, 2031 |  |  |
Unsecured Notes | $50 Million Series J Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 50,000 |  |  | 50,000
Stated interest rate | 2.95% |  |  |
Debt Instrument, Maturity Date | Sep. 28, 2033 |  |  |
Mortgage Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 54,397 |  |  | 54,983
Unamortized debt issuance costs | (71) |  |  | (103)
Debt Instrument, Unamortized Discount (Premium), Net | (136) |  |  | (136)
Principal outstanding | 54,190 |  |  | 54,744
Mortgage Loans Payable | Wells Fargo Bank, National Association CMBS Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 46,106 |  |  | 46,610
Stated interest rate | 4.31% |  |  |
Debt Instrument, Maturity Date | Dec. 01, 2022 |  |  |
Penalty free prepayment period | 3 months |  |  |
Mortgage Loans Payable | Thrivent Financial for Lutherans Due December 15, 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 3,397 |  |  | 3,430
Stated interest rate | 4.78% |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2023 |  |  |
Penalty free prepayment period | 3 months |  |  |
Mortgage Loans Payable | United of Omaha Life Insurance Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 4,894 |  |  | $ 4,943
Stated interest rate | 3.71% |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2039 |  |  |

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