Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components of property and equipment    
Total, at cost $ 844,652 $ 766,578
Less accumulated depreciation (249,528) (214,541)
Property and equipment, net 595,124 552,037
Land [Member]
    
Components of property and equipment    
Total, at cost 142,730 131,865
Buildings and improvements [Member]
    
Components of property and equipment    
Total, at cost 476,846 455,650
Office equipment and fixtures [Member]
    
Components of property and equipment    
Total, at cost 115,509 92,920
Parts and service equipment [Member]
    
Components of property and equipment    
Total, at cost 62,678 61,561
Company vehicles [Member]
    
Components of property and equipment    
Total, at cost 7,750 8,391
Construction in Progress [Member]
    
Components of property and equipment    
Total, at cost $ 39,139 $ 16,191