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Derivative Financial Instruments - Narrative (Details)
lb in Thousands
3 Months Ended
Sep. 30, 2015
USD ($)
lb
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
lb
Derivative [Line Items]      
Derivative, Term of Contract 22 months    
Derivative Instruments, Percentage Designated As Cash Flow Hedges     95.00%
Derivative, Nonmonetary Notional Amount | lb 37,316   34,242
Restricted cash $ 1,274,000   $ 1,002,000
Net losses to be reclassified into earnings within the next twelve months (8,000,000)    
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  
Cash Flow Hedges [Member]      
Derivative [Line Items]      
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net $ 0    
Derivative Instruments Designated as Cash Flow Hedges [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount | lb 35,588   32,288
Counterparty One [Member]      
Derivative [Line Items]      
Restricted cash $ 1,274,000   $ 1,002,000