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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 | 45,243,000 invest_DerivativeNonmonetaryNotionalAmount |  |  |
Notional amount on interest rate swap transaction |  |  |  | $ 10,000,000 us-gaap_DerivativeLiabilityNotionalAmount
Restricted cash | 7,192,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  | 0 us-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 |  | 0 us-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 | $ 0 us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |  |
Derivative Instruments Designated as Cash Flow Hedges [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount | 39,075,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |

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- Definition Derivative Instruments, Percentage Designated As Cash Flow Hedges + References No definition available. + Details
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Details
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- Definition The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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