Investments - Trading Securities (Details) - Trading Securities. - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
|
| Investments | |||||
| Cost | $ 16,572 | $ 16,572 | $ 14,874 | ||
| Gross unrealized gains | 331 | 5 | |||
| Gross unrealized losses | (800) | (2,160) | |||
| Trading securities, at fair value | 16,103 | 16,103 | $ 12,719 | ||
| Proceeds and realized gains and losses recognized | |||||
| Sale Proceeds | 865 | $ 180 | 1,435 | $ 628 | |
| Realized gains | 12 | 5 | 14 | 33 | |
| Realized losses | $ (12) | $ (4) | $ (31) | $ (6) | |