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Consolidated Statement of Shareholders' Equity and Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Tax effect of unrealized loss on available-for-sale investments $ 123 $ 185 $ 110
Tax effect of foreign currency translation adjustment 238 149 271
Accumulated Other Comprehensive Income (Loss)
      
Tax effect of unrealized loss on available-for-sale investments 123 185 110
Tax effect of foreign currency translation adjustment 238 149 271
Comprehensive Income (Loss)
      
Tax effect of unrealized loss on available-for-sale investments 123 185 110
Tax effect of foreign currency translation adjustment $ 238 $ 149 $ 271