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Derivative Financial Instruments (Details) (USD $)	3 Months Ended
Derivative Financial Instruments (Details) (USD $)	Mar. 31, 2014 Foreign currency exchange forwards	Mar. 31, 2013 Foreign currency exchange forwards	Mar. 31, 2014 Foreign currency collar	Mar. 31, 2014 Not Designated as Hedges	Dec. 31, 2013 Not Designated as Hedges	Mar. 31, 2014 Not Designated as Hedges Foreign currency exchange forwards	Dec. 31, 2013 Not Designated as Hedges Foreign currency exchange forwards	Mar. 31, 2014 Not Designated as Hedges Foreign currency collar	Dec. 31, 2013 Not Designated as Hedges Foreign currency collar
Derivative financial instruments
Fair value of derivative assets				$ 573,000	$ 907,000		$ 1,000	$ 573,000	$ 906,000
Notional amount of derivative instruments				40,469,000	38,769,000	6,400,000	4,700,000	34,069,000	34,069,000
Amount of realized net gain (loss) and changes in the fair value of derivatives	(95,000)	228,000	(333,000)
Weighted average notional amount of derivatives outstanding	$ 11,500,000	$ 2,400,000

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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