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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 75,151 $ 64,739 $ 73,596 $ 79,365
Total realized and unrealized losses        
Total foreign exchange losses (9) 13 (5) (8)
Purchases 124 (472) 4,606 19,397
Sales 0 (548) (946) (10,137)
Settlements 0   0 (5,739)
Balance at end of the period 79,066 68,351 79,066 68,351
Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other income (loss) 3,252 4,044 731 (10,492)
Other income (loss)        
Total realized and unrealized losses        
Included in other income (loss) 548 575 1,084 (4,035)
Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 81,344 71,450 79,807 74,634
Total realized and unrealized losses        
Total foreign exchange losses (9) 13 (5) (8)
Purchases 0 0 5,000 20,962
Sales 0 (548) (946) (10,137)
Settlements 0   0 0
Balance at end of the period 84,587 74,959 84,587 74,959
Other investments | Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other income (loss) 3,252 4,044 731 (10,492)
Other investments | Other income (loss)        
Total realized and unrealized losses        
Included in other income (loss) 0 0 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 (6,193) (6,711) (6,211) 4,731
Total realized and unrealized losses        
Total foreign exchange losses 0 0 0 0
Purchases 124 (472) (394) (1,565)
Sales 0 0 0 0
Settlements 0   0 (5,739)
Balance at end of the period (5,521) (6,608) (5,521) (6,608)
Other assets and (liabilities) | Net realized and unrealized (losses) gains on investments        
Total realized and unrealized losses        
Included in other income (loss) 0 0 0 0
Other assets and (liabilities) | Other income (loss)        
Total realized and unrealized losses        
Included in other income (loss) $ 548 $ 575 $ 1,084 $ (4,035)