This excerpt taken from the SMG 10-K filed Dec 14, 2006.
Goodwill, Indefinite-lived Intangibles and Long-lived Assets
We have significant investments in property and equipment, intangible assets and goodwill. Whenever changing conditions warrant, we review the realizability of the assets that may be affected. At least annually, we review goodwill and indefinite-lived intangible assets for impairment. The review for impairment of long-lived assets, intangibles and goodwill is primarily based on our estimates of future cash flows, which are based upon budgets and longer-range strategic plans. These budgets and plans are used for internal purposes and are also the basis for communication with outside parties about future business trends. While we believe the assumptions we use to estimate future cash flows are reasonable, there can be no assurance that the expected future cash flows will be realized. As a result, impairment charges that possibly should have been recognized in earlier periods may not be recognized until later periods if actual results deviate unfavorably from earlier estimates.