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Intangible assets Future intangible amortization schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Future intangible amortization schedule [Abstract]    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 1,352  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,492  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,600  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,406  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1,292  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 5,970  
Finite-Lived Intangible Assets, Net $ 13,112 $ 11,813