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Equity Investment (Summarized Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Equity Investment [Abstract]
Current assets	$ 4,202	$ 4,716
Noncurrent assets	14,480	14,876
Current liabilities	9,450	9,697
Noncurrent liabilities	$ 2,147	$ 2,255

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