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
Mar. 31, 2013
Dec. 31, 2012
Components of property and equipment    
Total, at cost $ 902,930 $ 844,652
Less accumulated depreciation (261,133) (249,528)
Property and equipment, net 641,797 595,124
Land [Member]
   
Components of property and equipment    
Total, at cost 160,490 142,730
Building and improvements [Member]
   
Components of property and equipment    
Total, at cost 506,734 476,846
Office equipment and fixtures [Member]
   
Components of property and equipment    
Total, at cost 118,658 115,509
Parts and service equipment [Member]
   
Components of property and equipment    
Total, at cost 65,589 62,678
Company vehicles [Member]
   
Components of property and equipment    
Total, at cost 7,916 7,750
Construction in progress [Member]
   
Components of property and equipment    
Total, at cost $ 43,543 $ 39,139