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Financial Instruments, Derivative Instruments and Hedging (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Financial Instruments Derivative Instruments And Hedging (Textual) [Abstract]
Estimated amount of net amounts of existing losses expected to be reclassified into income within next 12 months	$ 2,300,000
Aggregate fair value of derivative instruments in an asset position	$ 1,431,000	$ 1,000

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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