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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
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period $ 73,596 $ 79,365
Total realized and unrealized losses    
Total foreign exchange losses 3 (21)
Purchases (306) 20,351
Sales 0 (8,799)
Balance at end of the period 69,453 73,843
Net realized and unrealized losses on investments    
Total realized and unrealized losses    
Included in other income (loss) (3,936) (14,156)
Other income (loss)    
Total realized and unrealized losses    
Included in other income (loss) 96 (2,897)
Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 79,807 74,634
Total realized and unrealized losses    
Total foreign exchange losses 3 (21)
Purchases 0 20,962
Sales 0 (8,799)
Balance at end of the period 75,874 72,620
Other investments | Net realized and unrealized losses on investments    
Total realized and unrealized losses    
Included in other income (loss) (3,936) (14,156)
Other investments | Other income (loss)    
Total realized and unrealized losses    
Included in other income (loss) 0 0
Other assets and (liabilities)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period (6,211) 4,731
Total realized and unrealized losses    
Total foreign exchange losses 0 0
Purchases (306) (611)
Sales 0 0
Balance at end of the period (6,421) 1,223
Other assets and (liabilities) | Net realized and unrealized losses on investments    
Total realized and unrealized losses    
Included in other income (loss) 0 0
Other assets and (liabilities) | Other income (loss)    
Total realized and unrealized losses    
Included in other income (loss) $ 96 $ (2,897)