Subsequent Events (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
SUBSEQUENT EVENTS
Issuance of seller notes in connection with acquisitions		$ 7,885	$ 1,120
Subsequent Events
SUBSEQUENT EVENTS
Number of business acquisitions | item	2
Aggregate purchase price	$ 51,700
Consideration paid in cash	43,200
Issuance of seller notes in connection with acquisitions	4,500
Deferred payment obligations	$ 4,000
Beginning period for the deferred payment obligations payable	4 years
Thereafter period for payable deferred payment obligations	3 years
Subsequent Events | Minimum
SUBSEQUENT EVENTS
Period of notes payable in annual installments	3 years
Subsequent Events | Maximum
SUBSEQUENT EVENTS
Period of notes payable in annual installments	5 years