. the company may adjust the net book value of the underlying assets based upon such cash flow analysis compared to the book value and may also consid- er appraised values . assets to be disposed of are adjusted to the fair value less the cost to sell if less than the book value . the company recorded impairment charges of approximately $ 0.5 million and $ 0.6 million in 2004 and 2003 , respectively , and $ 4