Financial Derivatives (Futures) (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2019
USD ($)
| |
| Derivative [Line Items] | |
| Fair Value | $ (11,548) |
| Short | U.S. Treasury futures | |
| Derivative [Line Items] | |
| Notional Amount | (151,600) |
| Fair Value | $ (2,380) |
| Remaining Years to Maturity | 2 months 24 days |
| Short | Eurodollar futures | |
| Derivative [Line Items] | |
| Notional Amount | $ (63,000) |
| Fair Value | $ (74) |
| Remaining Years to Maturity | 5 months 29 days |
| Short | Currency futures | |
| Derivative [Line Items] | |
| Notional Amount | $ (15,840) |
| Fair Value | $ 138 |
| Remaining Years to Maturity | 2 months 19 days |
| Short | Futures | |
| Derivative [Line Items] | |
| Notional Amount | $ (230,440) |
| Fair Value | $ (2,316) |
| Remaining Years to Maturity | 3 months 20 days |