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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total realized and unrealized gains (losses)        
Amounts acquired     $ 19,970  
Other assets and (liabilities)        
Total realized and unrealized gains (losses)        
Settlements   $ (983)    
Amounts acquired     19,970  
Fair Value (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 82,752   46,186  
Total realized and unrealized gains (losses)        
Purchases (535)   13,509  
Settlements     20  
Balance at end of the period 80,429   80,429  
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other income (loss)        
Total realized and unrealized gains (losses)        
Included in other income (1,780)   760  
Total foreign exchange losses (8)   (16)  
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 74,810   54,545  
Total realized and unrealized gains (losses)        
Purchases 0   17,891  
Settlements     0  
Amounts acquired     0  
Balance at end of the period 74,210   74,210  
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments | Other income (loss)        
Total realized and unrealized gains (losses)        
Included in other income (592)   1,790  
Total foreign exchange losses (8)   (16)  
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 7,942 (2,018) (8,359) $ (2,952)
Total realized and unrealized gains (losses)        
Purchases (535) (9,668) (4,382) (9,379)
Settlements     20 983
Balance at end of the period 6,219 (8,949) 6,219 (8,949)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities) | Other income (loss)        
Total realized and unrealized gains (losses)        
Included in other income (1,188) $ 1,754 (1,030) $ 2,399
Total foreign exchange losses $ 0   $ 0