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Property and equipment - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 5,000 $ 3,900 $ 8,900 $ 8,200  
Increase in deposits and other     308 (1,553)  
Increase in other assets     726 1,000  
Cost of gaming operations $ 5,613 $ 3,169 $ 8,807 $ 6,053  
Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment, vehicles and other equipment     3 years    
Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment, vehicles and other equipment     6 years    
Gaming equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross, Reclassification Amount         $ 2,800
Gaming equipment [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment, vehicles and other equipment     3 years    
Gaming equipment [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment, vehicles and other equipment     6 years