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Derivatives (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in OCI [1] $ 574 $ (90)
Net gain (loss) reclassified from accumulated OCI into income [2] (86) 63
Net gain recognized in income [3] $ 0 $ 0
[1] Net change in fair value of the effective portion classified into other comprehensive income ("OCI")
[2] Effective portion classified within direct operating costs
[3] There were no ineffective portions for the period presented.