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Detail of Certain Balance Sheet Accounts Detail of Certain Balance Sheet Accounts (Property and Equipment) (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Capital expenditures incurred for purchase and construction of assets $ 50,900    
Capital Expenditures Incurred but Not yet Paid 21,241 $ 5,731 $ 32,700
Assets Held-for-sale, Long Lived 0   $ 1,400
Land and Building [Member]      
Property, Plant and Equipment [Line Items]      
Acquisition of fixed assets 7,900    
Land and Building [Member] | Dealership Acquisitions [Member]      
Property, Plant and Equipment [Line Items]      
Acquisition of fixed assets $ 28,800