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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