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FAIR VALUE MEASUREMENT (Details) (Fair value measured on recurring basis, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Level 1
   
Financial assets:    
Available-for-sale securities $ 100,572 $ 74,581
Total financial assets 100,572 74,581
Level 2
   
Financial assets:    
Trade receivables 74,411 67,300
Available-for-sale securities 5,246  
Fair value of derivative financial instruments 11,677 5,590
Total financial assets 91,334 72,890
Financial liabilities:    
Fair value of derivative financial instruments 1,878 467
Total
   
Financial assets:    
Trade receivables 74,411 67,300
Available-for-sale securities 105,818 74,581
Fair value of derivative financial instruments 11,677 5,590
Total financial assets 191,906 147,471
Financial liabilities:    
Fair value of derivative financial instruments $ 1,878 $ 467