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Intangible assets balances, subject to amortization, at September 30, 2013 and 2012, consisted of the following (in thousands): 

<img src='content_image/224905.jpg'>

All goodwill and intangible assets disclosed above are reported in our Electrical Power Products business segment. 

Amortization of intangible assets recorded for the years ended September 30, 2013, 2012 and 2011, was $1.7 million, $2.6 million and $4.8 million, respectively. 

Estimated amortization expense for each of the five subsequent fiscal years is expected to be (in thousands): 

## E. EARNINGS PER SHARE 

<img src='content_image/224904.jpg'>

We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common and potential common share includes the weighted average of additional shares associated with the incremental effect of dilutive restricted stock and restrictive stock units, as prescribed by the FASB guidance on earnings per share. 

The following table reconciles basic and diluted weighted average shares used in the computation of earnings per share for the years ended September 30, 2013, 2012 and 2011 (in thousands, except per share data): 

<img src='content_image/224914.jpg'>

(1) In Fiscal 2011, approximately 23,000 shares related to outstanding stock options and restricted stock units were excluded from the computation of diluted earnings (loss) per share because they were antidilutive. 

## F. DETAIL OF SELECTED BALANCE SHEET ACCOUNTS 

## Allowance for Doubtful Accounts 

Activity in our allowance for doubtful accounts consisted of the following (in thousands): 

<img src='content_image/224903.jpg'>

## Inventories 

The components of inventories are summarized below (in thousands): 

<img src='content_image/224902.jpg'>

