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Physical Delivery Contracts and Gas Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of realized and unrealized gains and losses
Unrealized (losses) gains			$ (177)	$ (59)
Commodity derivative contracts [Member]
Schedule of realized and unrealized gains and losses
Realized gains (losses)	184	77	318	184
Unrealized (losses) gains	(154)	(13)	(177)	(59)
Total realized and unrealized gains, net	$ 30	$ 64	$ 141	$ 125

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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