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
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total, at cost $ 1,737,829 $ 1,677,749
Less accumulated depreciation (548,958) (527,379)
Subtotal 1,188,871 1,150,370
Less assets held for sale (9,928) (3,489)
Property and equipment, net 1,178,943 1,146,881
Land    
Property, Plant and Equipment [Line Items]    
Total, at cost 383,749 370,828
Building and improvements    
Property, Plant and Equipment [Line Items]    
Total, at cost 942,426 893,768
Software and computer equipment    
Property, Plant and Equipment [Line Items]    
Total, at cost 150,520 147,812
Parts and service equipment    
Property, Plant and Equipment [Line Items]    
Total, at cost 111,497 105,123
Office equipment and fixtures    
Property, Plant and Equipment [Line Items]    
Total, at cost 96,381 96,066
Company vehicles    
Property, Plant and Equipment [Line Items]    
Total, at cost 9,839 9,723
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total, at cost $ 43,417 $ 54,429