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Other Investments (Summarized Investee Financial Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]                      
Total assets $ 4,840,534       $ 4,861,808       $ 4,840,534 $ 4,861,808  
Total liabilities 3,777,328       3,797,425       3,777,328 3,797,425  
Noncontrolling interests 211,910       193,414       211,910 193,414  
Total equity attributable to parent entities 851,296       870,969       851,296 870,969  
Revenues 50,760 $ 143,632 $ 54,254 $ 59,984 92,346 $ 64,221 $ 45,244 $ 122,288 308,630 324,099 $ 273,705
Expenses                 472,837 474,070 455,534
Net Income Attributable to Parent                 132,481 (42,441) 324,042
Equity Method Investment, Nonconsolidated Investee or Group of Investees                      
Schedule of Equity Method Investments [Line Items]                      
Total assets 6,107,890       4,184,503       6,107,890 4,184,503  
Total liabilities 3,019,208       2,250,720       3,019,208 2,250,720  
Noncontrolling interests 3,024       2,181       3,024 2,181  
Total equity attributable to parent entities $ 3,085,657       $ 1,931,602       3,085,657 1,931,602  
Revenues                 889,131 129,789 210,602
Expenses                 254,001 188,605 176,887
Net Income Attributable to Parent                 $ 634,896 $ (59,010) $ 33,522