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Derivative Instruments; Fair Value (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Derivatives not designated as hedging instruments under Statement 133 Interest Rate Contracts Interest Rate Contracts  
Balance Sheet Location   Accrued Liabilities Accrued Liabilities
Fair Value $ 97,000 $ 97,000 $ (5,000)