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Long-Term Debt (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended |  |  |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  | 6 Months Ended |  |  |  |
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Jun. 30, 2012 Agreement | Jun. 30, 2011 | Jun. 30, 2012 Agreement | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 9% Senior Subordinate Note due 2018 [Member] Rate | Dec. 31, 2011 9% Senior Subordinate Note due 2018 [Member] | Jun. 30, 2012 5% Convertible Senior Note due 2029 [Member] Rate | Jun. 30, 2011 5% Convertible Senior Note due 2029 [Member] | Jun. 30, 2012 5% Convertible Senior Note due 2029 [Member] D Rate | Jun. 30, 2011 5% Convertible Senior Note due 2029 [Member] | Dec. 31, 2011 5% Convertible Senior Note due 2029 [Member] | Jun. 30, 2012 Other Debt [Member] | Dec. 31, 2011 Other Debt [Member] | Jun. 30, 2012 Senior Subordinated Notes [Member] | Jul. 02, 2012 Senior Subordinated Notes [Member] | Dec. 31, 2011 Senior Subordinated Notes [Member] | Jun. 30, 2012 Senior Notes [Member] | Dec. 31, 2011 Senior Notes [Member] | Jun. 30, 2012 Mortgage Loan at Variable Interest Rate [Member] | Dec. 31, 2011 Mortgage Loan at Variable Interest Rate [Member] | Jun. 30, 2012 Mortgage Notes Payable [Member] | Dec. 31, 2011 Mortgage Notes Payable [Member] | Jun. 30, 2012 Mortgage Notes [Member] Properties | Jun. 30, 2012 Derivative Instruments and Hedging Activities [Member] | Jun. 30, 2012 Derivative Instruments and Hedging Activities [Member] Other Accrued Liabilities [Member] | Jun. 30, 2012 Derivative Instruments and Hedging Activities [Member] Other Long-Term Liabilities [Member] | Jun. 30, 2012 Maximum [Member] Rate | Jun. 30, 2012 Maximum [Member] Mortgage Loan at Fix Interest Rate [Member] Rate | Jun. 30, 2012 Maximum [Member] Mortgage Loan at Variable Interest Rate [Member] | Jun. 30, 2012 Minimum [Member] Rate | Jun. 30, 2012 Minimum [Member] Mortgage Loan at Fix Interest Rate [Member] Rate | Jun. 30, 2012 Minimum [Member] Mortgage Loan at Variable Interest Rate [Member] | Jun. 30, 2012 Weighted Average [Member] | Jun. 30, 2012 2011 Revolving Credit Facility [Member] Rate | Dec. 31, 2011 2011 Revolving Credit Facility [Member] Rate | Jun. 30, 2012 2011 Revolving Credit Facility [Member] Maximum [Member] | Jun. 30, 2012 2011 Credit Facility [Member] | Jun. 30, 2012 2011 Credit Facility [Member] Maximum [Member] | Mar. 31, 2012 2011 Credit Facility [Member] Maximum [Member] | Jun. 30, 2012 2011 Credit Facility [Member] Minimum [Member] | Mar. 31, 2012 2011 Credit Facility [Member] Minimum [Member]
Long-Term Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage on note |  |  |  |  |  | 9.00% |  | 5.00% |  | 5.00% |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  | 10.52% | 7.03% |  | 9.52% | 4.29% |  |  |  |  |  |  |  |  |  |
One-month LIBOR rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  | 1.25% |  |  |  |  |  |  |  |  |
Receive Rate (1) |  |  | one-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt weighted average interest rate on note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.67% |  |  |  |  |  |  |  |  |  | 10.19% |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.25% |  |  |  |  |  |
Discount associated with notes |  |  |  |  |  |  |  | $ 13,000,000 |  | $ 13,000,000 |  | $ 17,700,000 |  |  | $ 1,200,000 |  | $ 1,200,000 | $ 13,000,000 | $ 17,700,000 |  |  | $ 800,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium associated with notes | 1,000,000 |  | 1,000,000 |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity contingent increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  | 175,000,000 |  |  |  |  |
Percentage of fair market value of common stock to calculate available credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Number of common stock shares pledged as collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,200,000 |  |  |  |  |  |  |
Borrowing available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135,800,000 |  |  |  |  |  |  |
Indebtedness with outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBTDAR to rent ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.94 | 1.50 | 1.00 | 1.00
Unsecured senior subordinated obligations, description |  |  |  |  |  | 9.0% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Mar. 15, 2018 |  |  |  | Oct. 01, 2029 |  |  |  |  | Jul. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of 2011 Revolving credit facility and Floor plan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 15, 2016 |  |  |  |
Debt instrument date of required interest payments |  |  |  |  |  | semi-annually on March 15 and September 15 each year |  |  |  | semiannually on April 1 and October 1 of each year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument earliest redemption date |  |  |  |  |  | after March 15, 2014 |  |  |  | 2014-10-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indenture 9.0% notes |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maximum allowed dividends per share |  |  |  |  |  | $ 0.10 |  |  |  |  |  |  |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restrictive covenants |  |  |  |  |  | Jun. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of principle amount of 5.0% convertible notes |  |  |  |  |  |  |  |  |  | 20,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from repurchase of principle amount of 5.0% convertible notes |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of convertible senior notes |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business day |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days for Class A common stock |  |  |  |  |  |  |  | 30 days |  | 20 days |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to purchase on Second repurchase date |  |  |  |  |  |  |  |  |  | Oct. 01, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to purchase on third repurchase date |  |  |  |  |  |  |  |  |  | Oct. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum conversion price |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 537,570,000 |  | 537,570,000 |  | 547,619,000 | 210,000,000 | 210,000,000 | 134,905,000 |  | 134,905,000 |  | 155,055,000 | 5,590,000 | 5,752,000 |  |  |  |  |  | 63,930,000 | 65,640,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount per bond |  |  |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum principal amount of notes for each day of measurement period |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount on convertible senior notes net of taxes |  |  |  |  |  |  |  | 12,800,000 |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate of convertible senior notes |  |  |  |  |  |  |  |  |  | 75.3017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of notes, per share |  |  |  |  |  |  |  | $ 13.28 |  | $ 13.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount on convertible senior notes |  |  |  |  |  |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense associated with amortization of debt discount and deferred loan costs |  |  |  |  |  |  |  | 1,400,000 | 1,700,000 | 3,000,000 | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-convertible borrowing rate |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense related to Convertible Notes |  |  |  |  |  |  |  | 1,700,000 | 2,100,000 | 3,700,000 | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing aggregate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing related to dealership properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity of secured mortgage notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | between June 2013 and March 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,500,000 | 25,000,000 | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional forward | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cash flow swap agreements | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duration of Interest rate cash flow swap agreements |  |  | July 2015 and terminate in June 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest expense | 2,500,000 | 4,400,000 | 6,900,000 | 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net expense expected to be reclassified | $ 7,700,000 |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt instrument convertible interest expense excluding discount amortization. + References No definition available. + Details
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- Definition Debt instrument date of required interest payments. + References No definition available. + Details
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- Definition Debt instrument earliest redemption date. + References No definition available. + Details
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- Definition Debt instrument maximum allowed dividends per share. + References No definition available. + Details
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- Definition Debt instrument other outstanding indebtedness in excess. + References No definition available. + Details
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- Definition Debt instrument percentage of maximum redemption with cash from common stock offering. + References No definition available. + Details
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- Definition Debt instrument percentage of principal on stated redemption dates. + References No definition available. + Details
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- Definition Debt instrument third redemption date. + References No definition available. + Details
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- Definition Deferred tax portion of original debt discount on convertible notes issuance. + References No definition available. + Details
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- Definition EBTDAR to rent ratio. + References No definition available. + Details
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- Definition Line of credit facility maximum borrowing capacity contingent increase. + References No definition available. + Details
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- Details
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- Definition Number of common stock shares pledged as collateral. + References No definition available. + Details
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