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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Other assets and (liabilities) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period $ (2,952) $ (13,004)
Total realized and unrealized gains    
Purchases (34) (202)
Balance at end of the period (2,780) (12,135)
Other income (loss)    
Total realized and unrealized gains    
Included in other (loss) income $ 206 $ 1,071