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Inventories (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Changes In the Inventory Reserves |  |  |  |
Balance at beginning of period | $ 1,705 | $ 1,775 | $ 1,783 | $ 1,793
Provisions for losses | 39 | 294 | 44 | 279
Write-offs and disposals | (7) | (81) | (90) | (84)
Balance at end of period | $ 1,737 | $ 1,988 | $ 1,737 | $ 1,988

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