This excerpt taken from the PBI 10-K filed Feb 26, 2009.
We account for business combinations using the purchase method of accounting which requires that the assets acquired and liabilities assumed be recorded at the date of acquisition at their respective fair values. Goodwill represents the excess of the purchase price over the estimated fair values of net tangible and intangible assets acquired in business combinations. Goodwill is tested for impairment on an annual basis or as circumstances warrant. We estimate the fair value of intangible assets primarily using a cost, market and income approach. Intangible assets with finite lives acquired under business combinations are amortized over their estimated useful lives, principally 3 to 15 years. Customer relationship intangibles are generally amortized using an accelerated attrition method. All other intangibles are amortized on a straight-line method. See Note 6 to the Consolidated Financial Statements.