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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Financial assets and financial liabilities that are measured at fair value on a recurring basis
The following table presents our financial assets and financial liabilities that are measured at fair value on a recurring basis for each of the fair value hierarchy levels, including both current and noncurrent portions, as of December 31, 2012, September 30, 2012 and December 31, 2011:

 
Asset (Liability)
 
Quoted Prices
in Active
Markets for
Identical Assets
and Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
Total
December 31, 2012:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
374

 
$
160

 
$
—

 
$
534

Interest rate contracts
—

 
4,226

 
—

 
$
4,226

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(1,315
)
 
$
(7,726
)
 
$
—

 
$
(9,041
)
Interest rate contracts
$
—

 
$
(30,412
)
 
$
—

 
$
(30,412
)
September 30, 2012:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
5,468

 
$
—

 
$
—

 
$
5,468

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(671
)
 
$
(8,766
)
 
$
—

 
$
(9,437
)
Interest rate contracts
—

 
(30,522
)
 
—

 
$
(30,522
)
December 31, 2011:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
18

 
$
—

 
$
18

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(4,053
)
 
$
(12,067
)
 
$
—

 
$
(16,120
)
Interest rate contracts
$
—

 
$
(21,662
)
 
$
—

 
$
(21,662
)