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Other Investments (Summarized Investee Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Total assets [1] $ 4,861,808 $ 5,085,109  
Total liabilities [1] 3,797,425 3,847,149  
Noncontrolling interests [1] 193,414 197,538  
Total equity attributable to parent entities [1] 870,969 1,040,422  
Revenues 530,949 479,496 $ 798,122
Expenses (597,973) (575,897) (994,140)
Net income attributable to parent entities (42,441) 324,042 (32,262)
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Total assets 4,522,147 3,653,763  
Total liabilities 2,437,621 1,918,034  
Noncontrolling interests 2,124 1,486  
Total equity attributable to parent entities 2,082,402 1,734,243  
Revenues 149,928 214,123 262,970
Expenses (203,689) (181,456) (187,257)
Net income attributable to parent entities $ (53,955) $ 32,474 $ 75,056
[1] Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").