Fair Value Measurements - Contingent Consideration (Details) - USD ($) $ in Thousands |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
|
| Financial Liabilities | |||
| Balance, Contingent Consideration Arrangements | $ (702) | $ (716) | |
| CEMP change in fair value measurement | 14 | $ 4 | |
| Transfers between levels | 0 | 0 | |
| Investments, fair value | $ 16,800 | $ 13,300 | |