Derivatives (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in OCI	[1]	$ (90)	$ (51)	$ 141
Net gain (loss) reclassified from accumulated OCI into income	[2]	63	(223)	(99)
Net gain recognized in income	[3]	$ 0	$ 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.