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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
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 69,453 $ 73,843 $ 73,596 $ 79,365
Total realized and unrealized losses        
Total foreign exchange gains 1   4 (21)
Purchases 4,788 (482) 4,482 19,869
Sales (946) (790) (946) (9,589)
Settlements 0 (5,739) 0 (5,739)
Balance at end of the period 75,151 64,739 75,151 64,739
Net realized and unrealized gains (losses) on investments        
Total realized and unrealized losses        
Included in other income (loss) 1,415 (380) (2,521) (14,536)
Other income (loss)        
Total realized and unrealized losses        
Included in other income (loss) 440 (1,713) 536 (4,610)
Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 75,874 72,620 79,807 74,634
Total realized and unrealized losses        
Total foreign exchange gains 1   4 (21)
Purchases 5,000 0 5,000 20,962
Sales (946) (790) (946) (9,589)
Settlements 0 0 0 0
Balance at end of the period 81,344 71,450 81,344 71,450
Other investments | Net realized and unrealized gains (losses) on investments        
Total realized and unrealized losses        
Included in other income (loss) 1,415 (380) (2,521) (14,536)
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 (6,421) 1,223 (6,211) 4,731
Total realized and unrealized losses        
Total foreign exchange gains 0   0 0
Purchases (212) (482) (518) (1,093)
Sales 0 0 0 0
Settlements 0 (5,739) 0 (5,739)
Balance at end of the period (6,193) (6,711) (6,193) (6,711)
Other assets and (liabilities) | Net realized and unrealized gains (losses) 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) $ 440 $ (1,713) $ 536 $ (4,610)