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Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Other Assets [Member]
Notional amounts and estimated fair values of outstanding derivative positions
Derivative assets, Estimated Fair Value	$ 4,175
Other Liabilities [Member]
Notional amounts and estimated fair values of outstanding derivative positions
Derivative liabilities, Estimated Fair Value	(1,868)
Oil [Member]
Notional amounts and estimated fair values of outstanding derivative positions
Notional Units	Barrels
Derivative assets, Notional Amount	724
Derivative liabilities, Notional Amount	(724)
Derivative assets, Estimated Fair Value	3,464
Derivative liabilities, Estimated Fair Value	(1,948)
Natural Gas [Member]
Notional amounts and estimated fair values of outstanding derivative positions
Notional Units	MMBTUs
Derivative assets, Notional Amount	4,227
Derivative liabilities, Notional Amount	(4,227)
Derivative assets, Estimated Fair Value	1,424
Derivative liabilities, Estimated Fair Value	$ (633)