Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Components of property and equipment    
Total, at cost $ 808,796 $ 766,578
Less accumulated depreciation (240,867) (214,541)
Property and equipment, net 567,929 552,037
Land [Member]
    
Components of property and equipment    
Total, at cost 134,407 131,865
Buildings and improvements [Member]
    
Components of property and equipment    
Total, at cost 459,757 455,650
Office equipment and fixtures [Member]
    
Components of property and equipment    
Total, at cost 111,406 92,920
Parts and service equipment [Member]
    
Components of property and equipment    
Total, at cost 61,270 61,561
Company vehicles [Member]
    
Components of property and equipment    
Total, at cost 8,027 8,391
Construction in Progress [Member]
    
Components of property and equipment    
Total, at cost $ 33,929 $ 16,191