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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value Disclosures [Abstract]        
Unrealized gain (loss) included in OCI $ 0   $ 0  
Asset impairments $ 0 $ 0 $ 233,000 $ 6,079,000