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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Estimated Useful Lives

The range of estimated useful lives is as follows:

Buildings and improvements	5 to 40 years
Service equipment	5 to 15 years
Furniture, office equipment, signs and fixtures	3 to 10 years

Advertising Expense and Manufacturer Cooperative Advertising Credits

Advertising expense and manufacturer cooperative advertising credits were as follows (in thousands):

Year Ended December 31,		2017				2016				2015
Advertising expense, gross		$	116,124			$	101,656			$	89,736
Manufacturer cooperative advertising credits		(22,812		)		(20,293		)		(19,801		)
Advertising expense, net		$	93,312			$	81,363			$	69,935

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- Definition

Disclosure of accounting policy for advertising costs that are expensed, indicating whether such costs are expensed as incurred or the first period in which the advertising takes place and the offsetting cash consideration received from a vendor arising from cooperative advertising arrangements against advertising expense when such consideration represents a reimbursement of a specific, incremental, identifiable cost incurred by the entity in selling the vendor's products or services.

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- Definition

Tabular disclosure of useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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