What were the total cost and book value of property plant and equipment at december 31,2011?
Depreciation is computed for financial reporting purposes by use of the straight-line method based on useful lives of 20 to 35 yeras for buildings and 5 to 20 years for machinery and equipment. depreciation expences was $19,229, 18,279 and 17,862 in 2011, 2010 and respectively. when land is 21,939 buildings 107567 and machinery and equipment 322993 in 2011.