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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Range of Estimated Useful Lives | The range of estimated useful lives is as follows:
Leasehold and land improvements |  | 10-30 years
Buildings |  | 10-30 years
Parts and service equipment |  | 7-10 years
Office equipment and fixtures |  | 3-10 years
Company vehicles |  | 3-5 years

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