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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - Fair Value Measurements Using Level 3 - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount |  |
Liabilities |  |
Carrying value of debt | $ 1,459,691 | $ 1,341,242
Fair Value |  |
Liabilities |  |
Fair value of debt | $ 1,480,219 | $ 1,368,151

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