Basis of presentation (Tables)

6 Months Ended

Jun. 30, 2013

Estimated Useful Life of Assets and Leasehold Improvements

Provisions for depreciation are computed for financial reporting purposes using the straight-line method over the estimated useful life of the related asset and for leasehold improvements over the lesser of the estimated useful life of the related asset or the term of the related lease as follows:

Land and land improvements	Remaining term of Chinese land use right
Building and improvements	5 to 40 years or remaining term of leasehold
Machinery, equipment, furniture, and fixtures	3 to 10 years