Intangible assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,000	$ 700
Finite-Lived Intangible Assets, Gross	15,538		$ 15,204
Finite-Lived Intangible Assets, Accumulated Amortization	(3,070)		(2,092)
Finite-Lived Intangible Assets, Net	12,468		13,112
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	8,289		8,090
Finite-Lived Intangible Assets, Accumulated Amortization	(1,866)		(1,447)
Finite-Lived Intangible Assets, Net	6,423		6,643
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	7,249		7,114
Finite-Lived Intangible Assets, Accumulated Amortization	(1,204)		(645)
Finite-Lived Intangible Assets, Net	$ 6,045		$ 6,469