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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Fair Value (Level 3) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2015
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 79,365 $ 46,186   $ 46,186
Total realized and unrealized losses        
Total foreign exchange losses (21) (1)    
Purchases 20,351 9,365    
Sales (8,799)      
Settlements   20    
Amounts acquired   19,970    
Balance at end of the period 73,843 75,522   79,365
Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income (2,897) 1,093    
Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other (loss) income (14,156)     (1,111)
Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 74,634 54,545   54,545
Total realized and unrealized losses        
Total foreign exchange losses (21) (1)    
Purchases 20,962 10,262    
Sales (8,799)      
Settlements   0    
Amounts acquired   0    
Balance at end of the period 72,620 63,695   74,634
Other investments | Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income 0 0    
Other investments | Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other (loss) income     $ (1,111) (14,156)
Other assets and (liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 4,731 (8,359)   (8,359)
Total realized and unrealized losses        
Total foreign exchange losses 0 0    
Purchases (611) (897)    
Sales 0      
Settlements   20    
Amounts acquired   19,970    
Balance at end of the period 1,223 11,827   4,731
Other assets and (liabilities) | Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income (2,897) $ 1,093    
Other assets and (liabilities) | Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other (loss) income $ 0     $ 0