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Employee Future Benefits Expense - The net obligations associated with the defined benefit pension plans are actuarially valued using: the projected unit credit method; management's best estimates for long-term expected rate of return on plan assets; salary escalation and life expectancy; and a current market discount rate. All assumptions are reviewed at each reporting date.
Share-based Compensation - Estimating the fair value for share-based payment transactions requires determining the most appropriate inputs to the valuation model including: the expected life of the share option; volatility; and dividend yield.
3. ACCOUNTS RECEIVABLE
December 31 December 31 2012 2011----------------------------------------------------------------------------Trade receivables $ 221,999 $ 200,009Less: allowance for doubtful accounts (5,496) (5,574)----------------------------------------------------------------------------Trade receivables - net 216,503 194,435Other receivables 15,015 14,808----------------------------------------------------------------------------Trade and other receivables $ 231,518 $ 209,243--------------------------------------------------------------------------------------------------------------------------------------------------------
The aging of gross trade receivables at each reporting date was as follows:
December 31 December 31 2012 2011----------------------------------------------------------------------------Current to 90 days $ 211,750 $ 189,069Over 90 days 10,249 10,940---------------------------------------------------------------------------- $ 221,999 $ 200,009--------------------------------------------------------------------------------------------------------------------------------------------------------
The following table presents the movement in the Company's allowance for doubtful accounts:
Movement of provision December 31 December 31 2012 2011----------------------------------------------------------------------------Balance, beginning of year $ 5,574 $ 5,096Provisions and revisions, net (78) 478----------------------------------------------------------------------------Balance, end of year $ 5,496 $ 5,574--------------------------------------------------------------------------------------------------------------------------------------------------------
4. INVENTORIES
December 31 December 31 2012 2011----------------------------------------------------------------------------Equipment $ 219,549 $ 204,936Repair and distribution parts 76,783 73,725Direct materials 2,598 2,606Work-in-process 28,855 20,670---------------------------------------------------------------------------- $ 327,785 $ 301,937--------------------------------------------------------------------------------------------------------------------------------------------------------
