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Supplemental Consolidated Balance Sheet and Statement of Operations Information - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Jun. 30, 2013
Property, Plant and Equipment [Line Items]        
Property and equipment, gross $ 56,079 $ 55,619    
Less: accumulated depreciation and amortization (15,635) (13,029)    
Property and equipment, net 40,444 42,590    
Capital and financing leased assets, gross 37,274 38,350    
Less: accumulated amortization (5,891) (5,134)    
Capital and financing leases, net 31,383 33,216    
Buildings        
Property, Plant and Equipment [Line Items]        
Property and equipment, gross 36,608 36,603 $ 19,900 $ 17,100
Capital and financing leased assets, gross 36,608 36,603    
Computers, equipment and software        
Property, Plant and Equipment [Line Items]        
Property and equipment, gross 6,277 5,954    
Furniture and fixtures        
Property, Plant and Equipment [Line Items]        
Property and equipment, gross 8,428 8,283    
Vehicles        
Property, Plant and Equipment [Line Items]        
Property and equipment, gross 97 97    
Leasehold improvements        
Property, Plant and Equipment [Line Items]        
Property and equipment, gross 4,669 4,682    
Computers and equipment        
Property, Plant and Equipment [Line Items]        
Capital and financing leased assets, gross $ 666 $ 1,747