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Property and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 160,022 $ 152,289
Accumulated depreciation and amortization (107,175) (100,789)
Total property and equipment, net 52,847 51,500
Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 77,676 75,417
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 8,441 7,844
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 18,103 16,274
Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 47,408 42,048
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,394 $ 10,706