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Partnerships and Joint Ventures - Variable Interest Entities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Variable interest entity information    
Assets $ 7,309,812 $ 7,966,658
Variable Interest Entity, Primary Beneficiary    
Variable interest entity information    
Assets 1,300,000 1,100,000
Liabilities 703,000 798,000
Variable Interest Entity, Not Primary Beneficiary    
Variable interest entity information    
Net Assets 174,000 $ 217,000
Variable Interest Entity, Not Primary Beneficiary | Future funding commitment    
Variable interest entity information    
Future funding commitments $ 72,000