This excerpt taken from the KNXA 8-K filed Dec 26, 2006.
Goodwill and Other Intangible Assets
Goodwill represents the unamortized excess of the cost of acquiring companies over the fair values of such companies net assets at the dates of acquisition.
Goodwill is tested for impairment at the reporting unit annually on October 1, and whenever events or circumstances occur indicating that goodwill might be impaired. A two step impairment test is used to first to identify potential goodwill impairment and then measure the amount of goodwill impairment loss, if any. Goodwill, including goodwill recorded in past business combinations, is no longer amortized. Other intangible assets are being amortized by using the straight-line method over three years. The Company has recorded no other intangible assets with indefinite lives.
There were no goodwill impairments recorded in 2003, 2004 or 2005.