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Derivative Instruments (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value of Liabilities    
Gross derivative amounts recognized in the balance sheet $ 1,028us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement $ 861us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
Gross derivative amounts not offset in the balance sheet that are eligible for offsetting    
Gross derivative amounts not offset that are eligible for offsetting (84)us-gaap_DerivativeLiabilityFairValueGrossAsset (26)us-gaap_DerivativeLiabilityFairValueGrossAsset
Net amount $ 944us-gaap_DerivativeLiabilities $ 835us-gaap_DerivativeLiabilities