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Inventories (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Changes In the Inventory Reserves |  |  |  |
Balance at beginning of period | $ 1,737 | $ 1,988 | $ 1,783 | $ 1,793
Provisions for losses | 293 | 1,072 | 337 | 1,351
Write-offs and disposals | (3) | (1) | (93) | (85)
Balance at end of period | $ 2,027 | $ 3,059 | $ 2,027 | $ 3,059

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