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Risk Management Activities and Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Assets    
Gross Amounts Recognized $ 109,690 $ 89,563
Gross Amounts Offset in the Balance Sheet (65,013) (61,811)
Net Amounts Presented in the Balance Sheet 44,677 27,752
Margin Deposits not Offset in the Balance Sheet (36,939) (15,806)
Net Amount 7,738 11,946
Liabilities    
Gross Amounts Recognized 86,401 86,390
Gross Amounts offset in the Balance Sheets (65,013) (61,811)
Net Amounts Presented in the Balance Sheets 21,388 24,579
Margin Deposits not Offset in the Balance Sheet (19,786) (17,025)
Net Amounts 1,602 7,554
Net - Amounts Presented in the Balance Sheets 23,289 3,173
Net - Margin Deposits not Offset in the Balance Sheet (17,153) 1,219
Net 6,136 4,392
Commodity derivatives
   
Assets    
Gross Amounts Recognized 108,026 88,682
Gross Amounts Offset in the Balance Sheet (64,856) (61,706)
Net Amounts Presented in the Balance Sheet 43,170 26,976
Margin Deposits not Offset in the Balance Sheet (35,999) (15,030)
Net Amount 7,171 11,946
Liabilities    
Gross Amounts Recognized 86,231 85,975
Gross Amounts offset in the Balance Sheets (64,856) (61,706)
Net Amounts Presented in the Balance Sheets 21,375 24,269
Margin Deposits not Offset in the Balance Sheet (19,786) (16,861)
Net Amounts 1,589 7,408
Net - Amounts Presented in the Balance Sheets 21,795 2,707
Currency contracts
   
Assets    
Gross Amounts Recognized 1,664 881
Gross Amounts Offset in the Balance Sheet (157) (105)
Net Amounts Presented in the Balance Sheet 1,507 776
Margin Deposits not Offset in the Balance Sheet (940) (776)
Net Amount 567  
Liabilities    
Gross Amounts Recognized 170 415
Gross Amounts offset in the Balance Sheets (157) (105)
Net Amounts Presented in the Balance Sheets 13 310
Margin Deposits not Offset in the Balance Sheet   (164)
Net Amounts 13 146
Net - Amounts Presented in the Balance Sheets $ 1,494 $ 466