Summary of Significant Accounting Policies and Other Matters 4 Parentheticals (Details)	Dec. 31, 2011 MMBtu	Dec. 31, 2010 MMBtu
Transportation And Storage [Member]
Inventory Volume [Line Items]
Natural gas volumes	29,718,000	30,598,000
Gathering And Processing [Member]
Inventory Volume [Line Items]
NGL volumes	12,061,000	12,061,000
Distribution [Member]
Inventory Volume [Line Items]
Natural gas volumes	14,191,000	12,517,000