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Derivatives (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) recognized in OCI $ 743 [1] $ 966 [1] $ (1,883) [1]
Net gain (loss) reclassified from accumulated OCI into income (1,445) [2] (941) [2] 1,203 [2]
Net gain recognized in income $ 0 [3] $ 0 [3] $ 0 [3]
[1] Net change in the fair value of the effective portion classified in other comprehensive income (loss) (OCI).
[2] Effective portion classified within direct operating costs.
[3] There were no ineffective portions for the periods presented.