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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 73,843 $ 75,522 $ 79,365 $ 46,186
Total realized and unrealized losses        
Total foreign exchange losses   (7) (21) (8)
Purchases (482) 4,679 19,869 14,044
Sales (790)   (9,589)  
Settlements (5,739)   (5,739) 20
Amounts acquired       19,970
Balance at end of the period 64,739 82,752 64,739 82,752
Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income (1,713) (935) (4,610) 158
Net realized and unrealized gains on investments        
Total realized and unrealized losses        
Included in other (loss) income (380) 3,493 (14,536) 2,382
Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 72,620 63,695 74,634 54,545
Total realized and unrealized losses        
Total foreign exchange losses   (7) (21) (8)
Purchases 0 7,629 20,962 17,891
Sales (790)   (9,589)  
Settlements 0   0 0
Amounts acquired       0
Balance at end of the period 71,450 74,810 71,450 74,810
Other investments | Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income 0 0 0 0
Other investments | Net realized and unrealized gains on investments        
Total realized and unrealized losses        
Included in other (loss) income (380) 3,493 (14,536) 2,382
Other assets and (liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 1,223 11,827 4,731 (8,359)
Total realized and unrealized losses        
Total foreign exchange losses   0 0 0
Purchases (482) (2,950) (1,093) (3,847)
Sales 0   0  
Settlements (5,739)   (5,739) 20
Amounts acquired       19,970
Balance at end of the period (6,711) 7,942 (6,711) 7,942
Other assets and (liabilities) | Other income (loss)        
Total realized and unrealized losses        
Included in other (loss) income (1,713) (935) (4,610) 158
Other assets and (liabilities) | Net realized and unrealized gains on investments        
Total realized and unrealized losses        
Included in other (loss) income $ 0 $ 0 $ 0 $ 0