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Fair Value Measurements and Interest Rate Swaps - Interest Rate Swap (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jun. 09, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Fair Value of Assets (Liabilities) | $ (12,617) |  | $ (2,545)
Interest Rate Swap | $50 million term loan |  |  |
Derivative [Line Items] |  |  |
Rate Fixed | 2.41% |  |
Notional Amount | $ 50 |  |
Fair Value of Assets (Liabilities) | $ (3,231) |  | (1,597)
Interest Rate Swap | $350 million term loan |  |  |
Derivative [Line Items] |  |  |
Rate Fixed | 1.70% |  |
Notional Amount | $ 175 |  |
Fair Value of Assets (Liabilities) | (9,386) |  | $ (948)
Unsecured Term Loan |  |  |
Derivative [Line Items] |  |  |
Hedged Debt |  | $ 400,000 |
Unsecured Term Loan | $50 million term loan |  |  |
Derivative [Line Items] |  |  |
Hedged Debt | 50,000 |  |
Unsecured Term Loan | $350 million term loan |  |  |
Derivative [Line Items] |  |  |
Hedged Debt | $ 350,000 |  |

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