Quarterly report pursuant to Section 13 or 15(d)

Hedging Transactions (Offsetting Assets and Liabilities) (Details)

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Hedging Transactions (Offsetting Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jun. 30, 2013
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Net Derivative $ 339,656 $ 256,271
Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Gross Derivative 19,485 15,438
Derivative Asset, Amounts Netted (338) 0
Derivative Asset, Net Derivative 19,147 15,438
Derivative Liability, Gross Derivative 48,303 61,666
Derivative Liability, Amounts Netted (501) (17,823)
Derivative Liability, Cash Collateral Pledge (9,296) (7,015)
Derivative Liability, Net Derivative 38,506 36,828
Derivative Assets - Open Purchases and Sales Commitments | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Gross Derivative 3,631 0
Derivative Asset, Amounts Netted (338) 0
Derivative Asset, Net Derivative 3,293 0
Derivative Assets - Future Contracts | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Gross Derivative 10,921 14,967
Derivative Asset, Amounts Netted 0 0
Derivative Asset, Net Derivative 10,921 14,967
Derivative Assets - Forward Contracts | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Gross Derivative 4,933 471
Derivative Asset, Amounts Netted 0 0
Derivative Asset, Net Derivative 4,933 471
Derivative Liabilities - Open Purchases and Sales Commitments | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Liability, Gross Derivative 32,528 48,015
Derivative Liability, Amounts Netted (501) (17,823)
Derivative Liability, Cash Collateral Pledge 0 0
Derivative Liability, Net Derivative 32,027 30,192
Derivative Liabilities - Margin Accounts | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Liability, Gross Derivative 15,765 13,651
Derivative Liability, Amounts Netted 0 0
Derivative Liability, Cash Collateral Pledge (9,296) (7,015)
Derivative Liability, Net Derivative 6,469 6,636
Derivative Liabilities - Forward Contracts | Counterparty
    
Offsetting Assets and Liabilities [Line Items]    
Derivative Liability, Gross Derivative 10 0
Derivative Liability, Amounts Netted 0 0
Derivative Liability, Cash Collateral Pledge 0 0
Derivative Liability, Net Derivative $ 10 $ 0