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Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity    
Assets $ 16,988,516 $ 17,311,394
Liabilities 14,091,736 $ 13,811,776
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity    
Assets 310,190  
Liabilities $ 216,632