Investments (Proceeds from Sales and Realized Gains and Losses) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Investments [Abstract] | ||||
| Proceeds | $ 29,751 | $ 6,669 | $ 30,831 | $ 12,046 |
| Realized gains | $ 575 | $ 1 | $ 622 | 74 |
| Realized losses | $ 73 | |||