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
Jun. 30, 2012
Dec. 31, 2011
Components of property and equipment    
Total, at cost $ 793,769 $ 766,578
Less accumulated depreciation (232,395) (214,541)
Property and equipment, net 561,374 552,037
Land [Member]
    
Components of property and equipment    
Total, at cost 134,407 131,865
Buildings improvements [Member]
    
Components of property and equipment    
Total, at cost 455,973 455,650
Office equipment and fixtures [Member]
    
Components of property and equipment    
Total, at cost 108,044 92,920
Parts and service equipment [Member]
    
Components of property and equipment    
Total, at cost 62,136 61,561
Company vehicles [Member]
    
Components of property and equipment    
Total, at cost 8,183 8,391
Construction in Progress [Member]
    
Components of property and equipment    
Total, at cost $ 25,026 $ 16,191