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Intangible assets - Schedule of Expected Amortization Expense for Intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Entities Excluding HookLogic      
Finite-Lived Intangible Assets [Line Items]      
2017 $ 7,825    
2018 6,732    
2019 2,654    
2020 586    
2021 11    
Total 17,808    
Software      
Finite-Lived Intangible Assets [Line Items]      
Total 11,387 $ 6,881 $ 5,122
Software | Consolidated Entities Excluding HookLogic      
Finite-Lived Intangible Assets [Line Items]      
2017 5,116    
2018 4,321    
2019 2,218    
2020 586    
2021 11    
Total 12,252    
Technology and customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Total 90,663 $ 8,440 $ 7,356
Technology and customer relationships | Consolidated Entities Excluding HookLogic      
Finite-Lived Intangible Assets [Line Items]      
2017 2,709    
2018 2,411    
2019 436    
2020 0    
2021 0    
Total $ 5,556    
Software, Technology, and Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Average life (in years) 3 years