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Equipment and Improvements
9 Months Ended
Sep. 30, 2011
Equipment and Improvements [Abstract] 
Equipment and Improvements
10. Equipment and Improvements

Equipment and improvements are stated at cost. Depreciation is computed using the straight-line method based on the estimated useful lives of the assets, generally ranging from three to seven years. Leasehold improvements are amortized using the straight-line method over the shorter of the estimated useful life of the asset or the lease term.

The Company recorded an impairment charge against certain improvements in the amount of $5.3 million for the three month period ended September 30, 2011. Please see Note 11, “Impairment of Long-Lived Assets,” below.