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Intangible assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 700 $ 200  
Finite-Lived Intangible Assets, Gross 12,779   $ 13,093
Finite-Lived Intangible Assets, Accumulated Amortization (1,878)   (1,280)
Finite-Lived Intangible Assets, Net 10,901   11,813
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 7,994   8,182
Finite-Lived Intangible Assets, Accumulated Amortization (1,341)   (957)
Finite-Lived Intangible Assets, Net 6,653   7,225
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 4,785   4,911
Finite-Lived Intangible Assets, Accumulated Amortization (537)   (323)
Finite-Lived Intangible Assets, Net $ 4,248   $ 4,588