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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 488,004 $ 421,575  
Less: Accumulated depreciation and amortization (111,556) (93,767)  
Total Property, plant and equipment, net 376,448 327,808  
Depreciation and amortization 28,023 23,737 $ 22,340
Land and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 20,340 16,520  
Buildings, Building Improvements and Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 147,130 108,908  
Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 190,157 129,933  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 52,564 39,683  
Construction-in-progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 77,813 $ 126,531