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Other Investments - Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Equity Securities Without Readily Determinable Fair Value, Allowance For Credit Loss [Roll Forward]      
Balance at beginning of period $ 0    
Credit Loss 2,232    
Deductions 0    
Balance at end of period 2,232    
Accumulated earnings (losses) $ 569,446   $ 632,809
Accounting Standards Update 2016-13      
Equity Securities Without Readily Determinable Fair Value, Allowance For Credit Loss [Roll Forward]      
Accumulated earnings (losses)   $ 2,900  
Investments In And Advances To Affiliates, Subsidiaries, Associates, And Joint Ventures | Accounting Standards Update 2016-13      
Equity Securities Without Readily Determinable Fair Value, Allowance For Credit Loss [Roll Forward]      
Accumulated earnings (losses)   $ 2,100