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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 539,584 $ 488,004  
Less: Accumulated depreciation and amortization (132,374) (111,556)  
Total Property, plant and equipment, net 407,210 376,448  
Depreciation and amortization 32,242 28,023 $ 23,737
Land and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 21,843 20,340  
Buildings, Building Improvements and Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 160,005 147,130  
Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 206,819 190,157  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 50,829 52,564  
Construction-in-progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 100,088 $ 77,813