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Derivative Instruments and Risk Management Activities (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Interest Rate Swap [Member]
Sep. 30, 2014
Interest Rate Swap [Member]
Newly Added Interest Rate Swap [Member]
Sep. 30, 2014
Interest Rate Swaps Forward Starting [Member]
swap
Sep. 30, 2014
Interest Rate Swaps Forward Starting [Member]
Newly Added Interest Rate Swap [Member]
Sep. 30, 2014
Minimum [Member]
Interest Rate Swaps Forward Starting [Member]
Sep. 30, 2014
Maximum [Member]
Interest Rate Swaps Forward Starting [Member]
Oct. 31, 2014
Subsequent Event [Member]
Interest Rate Swaps Forward Starting [Member]
swap
Oct. 31, 2014
Subsequent Event [Member]
Minimum [Member]
Interest Rate Swaps Forward Starting [Member]
Oct. 31, 2014
Subsequent Event [Member]
Maximum [Member]
Interest Rate Swaps Forward Starting [Member]
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]                              
Interest rate hedges weighted average rate             2.60%   2.70%       2.57167%    
Increase in floor plan interest expense due to impact of interest rate hedges $ 2,400,000 $ 2,500,000                          
Floor Plan Interest Expense 10,452,000 10,690,000 31,695,000 30,927,000                      
Number of additional forward interest rate swaps                 13       3    
Forward swaps start date                     December 2014 January 2018   December 2016 January 2018
Forward swaps expiration date                     December 2017 December 2020   December 2019 December 2020
Aggregate notional value of nineteen additional forward interest rate swaps             463,000,000 13,000,000 675,000,000 150,000,000     150,000,000    
Maximum Notional Amount Of Derivatives In Effect At Any Time                 612,000,000            
Interest Rate Derivative Assets, at Fair Value         3,900,000                    
Amount expected to be reclassified from other comprehensive loss into earnings 12,100,000   12,100,000                        
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (14,344,000) $ (16,732,000) $ (14,344,000) $ (16,732,000) $ (13,850,000) $ (26,931,000)