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Derivatives (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net gain (loss) recognized in OCI $ (775) [1] $ 675 [1] $ (2,458) [1] $ 928 [1]
Net gain (loss) reclassified from accumulated OCI into income (876) [2] (443) [2] (607) [2] (1,115) [2]
Net gain (loss) recognized in income $ 0 [3] $ 0 [3] $ 0 [3] $ 0 [3]
[1] Net change in the fair value of the effective portion classified in other comprehensive income ("OCI").
[2] Effective portion classified as direct operating costs.
[3] There were no ineffective portions for the periods presented.