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Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Effect of Cash Flow Hedges on the Consolidated Balance Sheet
Asset fair value	$ 600
Hedge asset [Member]
Effect of Cash Flow Hedges on the Consolidated Balance Sheet
Asset fair value	$ 830	$ 6,418

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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