Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Components of Property and Equipment, Net (Details)

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Property and Equipment - Components of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,784,486 $ 1,677,749
Less accumulated depreciation (567,559) (527,379)
Subtotal 1,216,927 1,150,370
Less assets held for sale (9,664) (3,489)
Property and equipment, net 1,207,263 1,146,881
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment 385,814 370,828
Building and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 984,214 893,768
Software and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 127,515 147,812
Parts and service equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 108,281 105,123
Office equipment and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment 94,942 96,066
Company vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment 9,144 9,723
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 74,576 $ 54,429