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Derivative Financial Instruments - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
lb
Mar. 31, 2014
Jun. 30, 2014
Dec. 01, 2012
Derivative [Line Items]        
Derivative Instruments, Percentage Designated As Cash Flow Hedges   86.00%farm_DerivativeInstrumentsPercentageDesignatedAsCashFlowHedges    
Derivative, Nonmonetary Notional Amount 45,243,000invest_DerivativeNonmonetaryNotionalAmount      
Notional amount on interest rate swap transaction       $ 10,000,000us-gaap_DerivativeLiabilityNotionalAmount
Restricted cash 7,192,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue   0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue  
Net losses to be reclassified into earnings within the next twelve months (11,400,000)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths      
Derivative Instruments Designated as Cash Flow Hedges [Member]        
Derivative [Line Items]        
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net   0us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Cash Flow Hedges [Member]        
Derivative [Line Items]        
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net $ 0us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Derivative Instruments Designated as Cash Flow Hedges [Member]        
Derivative [Line Items]        
Derivative, Nonmonetary Notional Amount 39,075,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember