Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Derivative instruments and hedging activities (Narrative) (Details)

v3.2.0.727
Derivative instruments and hedging activities (Narrative) (Details)
$ in Thousands, € in Millions, ₪ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
EUR (€)
Jun. 30, 2015
ILS (₪)
Dec. 31, 2014
USD ($)
Derivatives, Fair Value [Line Items]              
Gains (loss) on derivative instrument $ (600) $ 1,200 $ 3,600 $ 200      
Foreign Exchange Contract [Member] | Other current assets [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Assets derivatives - Notional amount 14,237   14,237       $ 45,000
Liability derivatives - Notional amount 57,500   57,500   € 52.5    
Foreign Exchange Contract [Member] | Accrued expenses and other current liabilities [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member]              
Derivatives, Fair Value [Line Items]              
Assets derivatives - Notional amount $ 20,683   $ 20,683        
Liability derivatives - Notional amount             $ 38,426
Foreign Exchange Contract [Member] | Accrued expenses and other current liabilities [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Assets derivatives - Notional amount $ 13,900   $ 13,900     ₪ 51.7  
Liability derivatives - Notional amount $ 57,220   $ 57,220       $ 18,424