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ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2012
ACCOUNTING POLICIES [Abstract]  
Property, Plant and Equipment
Property and Equipment–Property and equipment is recorded at historical cost, less accumulated depreciation. For financial reporting purposes, the cost of such property is depreciated principally by the straight-line method. For tax reporting purposes, accelerated depreciation or applicable cost recovery methods are used. Depreciation is recognized over the estimated asset life, considering the estimated salvage value of the asset. Such salvage values are based on estimates using expected market values for used equipment and the estimated time of disposal which, in many cases include guaranteed residual values by the manufacturers. Gains and losses are reflected in the year of disposal. The following is a table reflecting estimated ranges of asset useful lives by major class of depreciable assets:
 
Asset Class
Estimated Asset Life
   
Service vehicles
3-5 years
Office furniture and equipment
3-7 years
Revenue equipment
3-12 years
Structure and improvements
5-40 years