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Inventories (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes In the Inventory Reserves      
Balance at beginning of year $ 1,793 $ 1,676 $ 4,141
Provisions for (realization of) losses 590 184 (2,404)
Write-offs and disposals (600) (67) (61)
Balance at end of year $ 1,783 $ 1,793 $ 1,676