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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ (2,952)  
Total realized and unrealized gains    
Purchases 45,254  
Settlements 983  
Ending balance 46,186 $ (2,952)
Other income (loss)    
Total realized and unrealized gains    
Included in other income 2,901  
Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0  
Total realized and unrealized gains    
Purchases 54,545  
Settlements 0  
Ending balance 54,545 0
Other investments | Other income (loss)    
Total realized and unrealized gains    
Included in other income 0  
Other assets and (liabilities)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (2,952) (13,004)
Total realized and unrealized gains    
Purchases (9,291) 354
Settlements 983 5,937
Ending balance (8,359) (2,952)
Other assets and (liabilities) | Other income (loss)    
Total realized and unrealized gains    
Included in other income $ 2,901 $ 3,761