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Derivative Instruments (Details 1) (Hedge asset [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Hedge asset [Member]
Derivatives, Fair Value [Line Items]
Derivitive Asset, Fair Value, Gross Asset, Current	$ (3,137)
Derivative Asset, Fair Value, Gross Asset, Noncurrent	(251)
Effect of Cash Flow Hedges on the Consolidated Balance Sheet
Asset fair value		$ 830

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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