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Assets and Liabilities Measured at Fair Value (Details) (Recurring fair value measurements, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Level 2
Assets and liabilities measured at fair value
Derivative financial instruments	$ 2	$ 2
Total
Assets and liabilities measured at fair value
Derivative financial instruments	$ 2	$ 2

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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