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Derivative Instruments and Risk Management Activities (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
swap
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
swap
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]            
Increase in floor plan interest expense due to impact of interest rate hedges $ 2,900 $ 2,800 $ 5,600 $ 5,500    
Floor Plan Interest Expense $ 11,593 10,015 22,603 19,362    
Forward swaps expiration date Mar. 01, 2023          
Fair value of derivative financial instruments included in balance sheet as liabilities from interest risk management activities $ 51,134   51,134   $ 31,153  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (31,959) $ (18,671) (31,959) $ (18,671) $ (19,452) $ (17,909)
Amount expected to be reclassified from other comprehensive loss into earnings 13,800   13,800      
Interest Rate Swap [Member]            
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]            
Aggregate notional value of forward interest rate swaps $ 616,700   $ 616,700      
Derivative, Average Fixed Interest Rate 2.60%   2.60%      
Interest Rate Swaps Forward Starting [Member]            
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]            
Aggregate notional value of forward interest rate swaps $ 850,000   $ 850,000      
Derivative, Average Fixed Interest Rate 2.30%   2.30%      
Number of additional forward interest rate swaps | swap 17   17      
Maximum Notional Amount Of Derivatives In Effect At Any Time $ 908,600   $ 908,600      
Minimum [Member] | Interest Rate Swaps Forward Starting [Member]            
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]            
Forward swaps start date Dec. 31, 2016          
Forward swaps expiration date Dec. 31, 2019          
Maximum [Member] | Interest Rate Swaps Forward Starting [Member]            
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]            
Forward swaps start date Jan. 02, 2019          
Forward swaps expiration date Dec. 31, 2021