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Derivative Instruments and Risk Management Activities (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2018 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | $ 623,000,000 | $ 765,300,000 |  |  |
Notional amount of interest rate swaps entered into during current year | 110,600,000 |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (7,623,000) | (8,393,000) | $ (8,313,000) |  |
Floorplan interest expense | $ 52,372,000 | 44,927,000 | 39,264,000 |  |
Derivative, Maturity Date | Dec. 31, 2030 |  |  |  |
Maximum Notional Amount Of Derivatives In Effect At Any Time | $ 918,400,000 |  |  |  |
Unrealized gain (loss) related to hedges, net of income taxes included in other comprehensive loss | (674,000) | (9,331,000) | (19,452,000) |  | $ (17,909,000)
Amount expected to be reclassified from other comprehensive loss into earnings | 6,900,000 |  |  |  |
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net | $ 0 |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Average Fixed Interest Rate | 2.50% |  |  |  |
Interest Rate Swaps Forward Starting [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | $ 575,000,000 |  |  |  |
Derivative, Average Fixed Interest Rate | 2.10% |  |  |  |
Number of additional forward interest rate swaps | 11 |  |  |  |
Interest Rate Swaps expiring in 2017 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | $ 153,600,000 |  |  |  |
Interest Rate Swaps expiring in 2018 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | 353,700,000 |  |  |  |
Interest Rate Swaps expiring in 2019 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | 53,700,000 |  |  |  |
Interest Rate Swaps expiring in 2020 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | 12,000,000 |  |  |  |
Interest Rate Swaps expiring in 2021 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | 18,800,000 |  |  |  |
Interest Rate Swaps expiring in 2022 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | 26,900,000 |  |  |  |
Expires in 2023 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount | $ 4,200,000 |  |  |  |
Minimum [Member] | Interest Rate Swaps Forward Starting [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Inception Date | Jan. 01, 2018 |  |  |  |
Derivative, Maturity Date | Dec. 31, 2020 |  |  |  |
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 | $ 10,272,000 | 11,097,000 | $ 11,486,000 |  |
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 | 10,579,000 | 24,411,000 |  |  |
Interest Rate Derivative Assets, at Fair Value | $ 9,501,000 | $ 9,484,000 |  |  |
Scenario, Forecast [Member] | Interest Rate Swaps Forward Starting [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount |  |  |  | $ 200,000,000 |

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- 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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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