The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Detail of Certain Balance Sheet Accounts (Property and Equipment) (Details) (USD $)	6 Months Ended		6 Months Ended				3 Months Ended				3 Months Ended			3 Months Ended				3 Months Ended				3 Months Ended				6 Months Ended
	Jun. 30, 2013 dealerships	Dec. 31, 2012	Jun. 30, 2013 Land [Member]	Dec. 31, 2012 Land [Member]	Jun. 30, 2013 Buildings [Member]	Dec. 31, 2012 Buildings [Member]	Jun. 30, 2013 Buildings [Member] Minimum [Member]	Jun. 30, 2013 Buildings [Member] Maximum [Member]	Jun. 30, 2013 Leasehold improvements [Member]	Dec. 31, 2012 Leasehold improvements [Member]	Jun. 30, 2013 Leasehold improvements [Member] Minimum [Member]	Jun. 30, 2013 Machinery and equipment [Member]	Dec. 31, 2012 Machinery and equipment [Member]	Jun. 30, 2013 Machinery and equipment [Member] Minimum [Member]	Jun. 30, 2013 Machinery and equipment [Member] Maximum [Member]	Jun. 30, 2013 Furniture and fixtures [Member]	Dec. 31, 2012 Furniture and fixtures [Member]	Jun. 30, 2013 Furniture and fixtures [Member] Minimum [Member]	Jun. 30, 2013 Furniture and fixtures [Member] Maximum [Member]	Jun. 30, 2013 Company vehicles [Member]	Dec. 31, 2012 Company vehicles [Member]	Jun. 30, 2013 Company vehicles [Member] Minimum [Member]	Jun. 30, 2013 Company vehicles [Member] Maximum [Member]	Jun. 30, 2013 Construction in progress [Member]	Dec. 31, 2012 Construction in progress [Member]	Jun. 30, 2013 Land and Building [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives							P30Y	P40Y			varies			P7Y	P20Y			P3Y	P10Y			P3Y	P5Y
Total	$ 872,056,000	$ 830,805,000	$ 238,087,000	$ 232,944,000	$ 352,682,000	$ 331,526,000			$ 111,397,000	$ 97,651,000		$ 73,371,000	$ 69,630,000			$ 67,449,000	$ 61,627,000			$ 8,478,000	$ 9,239,000			$ 20,592,000	$ 28,188,000
Less accumulated depreciation and amortization	(165,763,000)	(163,037,000)
Property and equipment, net	706,293,000	667,768,000
Capital expenditures incurred for purchase and construction of assets	32,400,000
Acquisition of fixed assets			$ 10,700,000																							$ 31,700,000
Number of dealerships acquired	23