Commitments and Contingencies Contingencies (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Dec. 31, 2018 |
Mar. 31, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Commitments and Contingencies Disclosure [Abstract] | ||||
Contract settlement | $ 12,700 | $ 28,900 | $ 2,083 | $ 0 |
contingent consideration gross | $ 225,000 | $ 225,000 |