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Financial Risk Management and Derivatives (Details) (USD $)
3 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Forward Foreign Currency Exchange Contracts [Member]
Mar. 31, 2014
Forward Foreign Currency Exchange Contracts [Member]
Jun. 30, 2014
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Jun. 30, 2013
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]            
Notional amount of foreign currency derivatives     $ 18,153,000 $ 17,796,000    
Forward foreign currency exchange contracts         233,000 (733,000)
Forward foreign currency exchange contracts included in other current liabilities   159,000        
Forward foreign currency exchange contracts included in prepaid expenses and other current assets $ 74,000