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Consolidated Statement of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Tax effect of unrealized gain on derivative instruments $ 13    
Tax effect of unrealized gain (loss) on available-for-sale investments (147) 129 123
Tax effect of foreign currency translation adjustment 22 7 238
Accumulated Other Comprehensive Income (Loss) [Member]
      
Tax effect of unrealized gain on derivative instruments 13    
Tax effect of unrealized gain (loss) on available-for-sale investments (147) 129 123
Tax effect of foreign currency translation adjustment $ 22 $ 7 $ 238