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Impairment and Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]            
Impairment and credit losses $ 40,621 $ 156,497   $ 40,172 $ 1,264,615  
Asset impairment charges   64,900     1,100,000  
Credit loss   $ 91,600   $ 4,663 $ 129,700 $ 81,600
Equity method investments, other than temporary impairment     $ 39,700      
Construction in Progress            
Property, Plant and Equipment [Line Items]            
Asset impairment charges $ 40,600