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Derivative Instruments and Risk Management Activities (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) swap	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) swap	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]
Interest Rate Swaps Latest Expiration			Aug. 01, 2021
Increase in floor plan interest expense due to impact of interest rate hedges	$ 2,800	$ 2,500	$ 5,500	$ 4,900
Floor Plan Interest Expense	10,015	10,329	19,362	21,242
Amount expected to be reclassified from other comprehensive loss into earnings	13,100		13,100
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ (18,671)	$ (16,710)	$ (18,671)	$ (16,710)	$ (17,909)	$ (13,850)
Interest Rate Swap [Member]
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]
Interest rate hedges weighted average rate	2.50%		2.50%
Aggregate notional value of nineteen additional forward interest rate swaps	$ 562,500		$ 562,500
Interest Rate Swaps Forward Starting [Member]
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]
Interest rate hedges weighted average rate	2.80%		2.80%
Number of additional forward interest rate swaps | swap	15		15
Aggregate notional value of nineteen additional forward interest rate swaps	$ 775,000		$ 775,000
Maximum Notional Amount Of Derivatives In Effect At Any Time	$ 761,000		$ 761,000
Minimum [Member] | Interest Rate Swaps Forward Starting [Member]
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]
Forward swaps start date			Aug. 28, 2015
Forward swaps expiration date			Dec. 01, 2017
Maximum [Member] | Interest Rate Swaps Forward Starting [Member]
Additional Derivative Instruments and Risk Management Activities (Textual) [Abstract]
Forward swaps start date			Jan. 01, 2018
Forward swaps expiration date			Dec. 01, 2020

X

- Definition

Interest expense incurred on borrowings under the floorplan line of the credit facility and arrangements with vehicle manufacturer affiliates for the financing of specific new, used and rental vehicle inventory. Interest expense also includes the net impact of interest rate swap settlements during the period, which are designed to hedge exposure to variable interest rates.

+ References

No definition available.

+ Details

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- Definition

Forward swaps expiration date

+ References

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- Definition

Forward swaps start date

+ References

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- Definition

The increase or decrease in floorplan interest expense due to interest rate hedges.

+ References

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- Definition

Weighted average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Interest Rate Swaps Latest Expiration

+ References

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- Definition

Maximum notional amount of derivatives in effect at any time.

+ References

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Article 12



-Section 13



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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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-SubTopic 10



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- Definition

The number of derivative instruments of a particular group held by the entity.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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