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Fair Value Measurements (Details Textuals) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Derivative Asset, Fair Value, Gross Asset $ 1,800,000 $ 400,000
Derivative Liability, Fair Value, Gross Liability 7,100,000 8,900,000
Cash Equivalents 14,300,000 13,600,000
Fair Value, Measurements, Recurring [Member]
   
Cash Equivalents $ 14,311,000 $ 13,636,000