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Fair Value Measurements and Interest Rate Swaps - Interest Rate Derivatives (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Interest Rate Swap |  |
Derivative [Line Items] |  |
Fair Value of Assets (Liabilities) | $ (8,129) | $ (12,617)
Interest Rate Swap | $50 million term loan |  |
Derivative [Line Items] |  |
Rate Fixed | 2.41% |
Notional Amount | $ 50,000 |
Fair Value of Assets (Liabilities) | $ (2,219) | (3,231)
Interest Rate Swap | $350 million term loan |  |
Derivative [Line Items] |  |
Rate Fixed | 1.70% |
Notional Amount | $ 175,000 |
Fair Value of Assets (Liabilities) | (5,910) | (9,386)
Unsecured Term Loan | $50 million term loan |  |
Derivative [Line Items] |  |
Hedged Debt | 50,000 | 50,000
Unsecured Term Loan | $350 million term loan |  |
Derivative [Line Items] |  |
Hedged Debt | $ 350,000 | $ 350,000

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