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Derivative Instruments (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value of Assets    
Gross derivative amounts recognized in the balance sheet $ 2,411us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement $ 2,155us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
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_DerivativeAssetFairValueGrossLiability (26)us-gaap_DerivativeAssetFairValueGrossLiability
Net amount $ 2,327us-gaap_DerivativeAssets $ 2,129us-gaap_DerivativeAssets