Commitments and Contingencies Contract Settlement (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
Commitments and Contingencies Disclosure [Abstract] | |||||
contract settlement | $ 0 | $ 12,700 | $ 0 | $ 3,822 | $ 28,917 |