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Property and Equipment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property Plant and Equipment (Textual) [Abstract]      
Asset impairment charges of property and equipment $ 2,800 $ 2,100  
Capital expenditures incurred for purchase and construction of assets 100,600 107,200  
Capital Expenditures Incurred but Not yet Paid 15,930 32,720 $ 21,166
Assets Held-for-sale, Long Lived   1,400  
Depreciation and amortization 51,200 47,200 $ 42,300
Building recorded under capital lease included in property plant equipment before accumulated depreciation 68,900 69,600  
Land and Building [Member]      
Property Plant and Equipment (Textual) [Abstract]      
Acquisition of fixed assets 28,800 9,800  
Dealership Acquisitions [Member]      
Property Plant and Equipment (Textual) [Abstract]      
Acquisition of fixed assets   $ 24,600  
Dealership Acquisitions [Member] | Land and Building [Member]      
Property Plant and Equipment (Textual) [Abstract]      
Acquisition of fixed assets $ 39,100