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Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Line Items]    
Notes payable, carrying value $ 618,678 $ 690,559
Senior Notes    
Fair Value Disclosures [Line Items]    
Notes payable, carrying value 296,520 296,028
Senior notes, fair value $ 335,718 $ 337,853