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Goodwill and other intangible assets (Remaining amortization expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
2017 $ 3,585    
2018 1,505    
2019 1,389    
2020 1,041    
2021 1,041    
2022 and thereafter 2,863    
Intangible assets with a finite life, net $ 11,424 $ 17,090 $ 22,756