This excerpt taken from the AN 10-K filed Feb 17, 2010.
The following table summarizes the total stock-based compensation expense recognized in selling, general, and administrative expenses in the Consolidated Statements of Operations:
(1) Stock-based compensation expense during 2008 includes $5.3 million of additional stock-based compensation expense that was recorded in the second quarter of 2008 to reflect the correction of our expense attribution method to accelerate stock-based compensation expense for employees who were or will become retirement-eligible prior to the stated vesting period of the award.
As of December 31, 2009, there was $12.8 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements, of which $10.5 million relates to stock options and $2.3 million relates to restricted stock. These amounts are expected to be recognized over a weighted average period of 1.6 years.