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Fair Value Measurements
 3 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
Derivative Financial Instruments
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
)


The fair values of our Level 1 exchange-traded commodity futures and option derivative contracts and certain non exchange-traded electricity forward contracts are based upon actively-quoted market prices for identical assets and liabilities. The fair values of the remainder of our derivative financial instruments and electricity forward contracts, which are designated as Level 2, are generally based upon recent market transactions and related market indicators. There were no transfers between Level 1 and Level 2 during the periods presented.
Other Financial Instruments
The carrying amounts of other financial instruments included in current assets and current liabilities (except for current maturities of long-term debt) approximate their fair values because of their short-term nature. The carrying amount and estimated fair value of our long-term debt at December 31, 2012, were $600,000 and $696,217, respectively. The carrying amount and estimated fair value of our long-term debt at December 31, 2011, were $640,000 and $747,461, respectively. We estimate the fair value of long-term debt by using current market rates and by discounting future cash flows using rates available for similar types of debt (Level 2).