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Derivative Instruments and Risk Management Activities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount $ 765,300,000 $ 581,700,000    
Notional amount of interest rate swaps entered into during current year 335,200,000      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (8,393,000) (8,313,000) $ (7,094,000)  
Floorplan interest expense $ 44,927,000 39,264,000 41,614,000  
Derivative, Maturity Date Dec. 31, 2030      
Maximum Notional Amount Of Derivatives In Effect At Any Time $ 908,600,000      
Unrealized gain (loss) related to hedges, net of income taxes included in other comprehensive loss 9,331,000 $ 19,452,000 17,909,000 $ 13,850,000
Amount expected to be reclassified from other comprehensive loss into earnings $ 12,200,000      
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Fixed Interest Rate 2.50% 2.70%    
Interest Rate Swaps Forward Starting [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount $ 675,000,000      
Derivative, Average Fixed Interest Rate 2.20%      
Notional amount of interest rate swaps entered into during current year $ 325,000,000      
Number of additional forward interest rate swaps 13      
Interest Rate Swaps expiring in 2017 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount $ 253,000,000      
Interest Rate Swaps expiring in 2018 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount 153,000,000      
Interest Rate Swaps expiring in 2019 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount 303,100,000      
Interest Rate Swaps expiring in 2020 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount 3,100,000      
Interest Rate Swaps expiring in 2021 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount 11,400,000      
Interest Rate Swaps expiring in 2022 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount 15,200,000      
Expires in 2023 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount $ 26,500,000      
Minimum [Member] | Interest Rate Swaps Forward Starting [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Inception Date Jan. 01, 2017      
Derivative, Maturity Date Dec. 31, 2019      
Maximum [Member] | Interest Rate Swaps Forward Starting [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Inception Date Dec. 31, 2020      
Derivative, Maturity Date Dec. 31, 2030      
Floorplan Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax $ 11,097,000 $ 11,486,000 $ 9,837,000  
Fair Value, Inputs, Level 2 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Fair value of derivative financial instruments included in balance sheet as liabilities from interest risk management activities 24,411,000 31,153,000    
Interest Rate Derivative Assets, at Fair Value $ 9,484,000 $ 31,000