Fair Value Measurements - Assets and liabilities that were recognized at fair value on a recurring basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Liabilities
Total	$ 71,936	$ 13,878
Earn-out
Liabilities
Earn-out liability	3,480	11,100
Level 2
Liabilities
Total	68,456
Level 3
Liabilities
Total	3,480	11,100
Level 3 | Earn-out
Liabilities
Earn-out liability	3,480	11,100
Interest rate swap asset
Liabilities
Interest rate swap liability	8,372	2,778
Interest rate swap asset | Level 2
Liabilities
Interest rate swap liability	$ 8,372	$ 2,778