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Hedging Activities And Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Foreign currency contracts $ 0   $ 0   $ 0
Foreign currency translation on accumulated other comprehensive income (loss) (6,611) $ 14,592 1,239 $ (6,240)  
Interest Expense [Member]          
Foreign currency transaction gain (loss) $ (55) $ 428 $ 1,463 $ (1,767)