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Derivatives (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain recognized in OCI $ 259 [1] $ (1,977) [1] $ 529 [1] $ (1,683) [1]
Net gain (loss) reclassified from accumulated OCI into income 4 [2] (39) [2] (381) [2] 269 [2]
Net gain recognized in income $ 0 [3] $ 0 [3] $ 0 [3] $ 0 [3]
[1] Net change in fair value of the effective portion classified into other comprehensive income ("OCI")
[2] Effective portion classified within direct operating cost
[3] There were no effective portions for the period presented.