Fair-Value Measurements

12 Months Ended

Dec. 31, 2011

Fair-Value Measurements [Abstract]

Fair-Value Measurements

18. Fair-Value Measurements

The following table sets forth by level within the fair value hierarchy our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2011 and 2010. As required by fair value accounting guidance, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value requires judgment and may affect the placement of assets and liabilities within the fair value hierarchy levels.

	Fair Value at December 31, 2011							Fair Value at December 31, 2010
Recurring Fair Value Measures	Level 1			Level 2		Level 3		Level 1			Level 2		Level 3
Commodity derivatives:
Assets	$	306		$	—	$	—	$	507		$	—	$	—
Liabilities	$	(2,820	)	$	—	$	—	$	(2,474	)	$	—	$	—

Level 1

Included in Level 1 of the fair value hierarchy as commodity derivative contracts are exchange-traded futures and exchange-traded option contracts. The fair value of these exchange-traded derivative contracts is based on unadjusted quoted prices in active markets and is, therefore, included in Level 1 of the fair value hierarchy.

Level 2 and Level 3

At December 31, 2011 and 2010, we had no Level 2 or Level 3 fair value measurements. During 2010, we settled our interest rate swaps, which were classified as Level 3 fair value measurements. The following table provides a reconciliation of changes in fair value of our interest rate swaps during 2010 and 2009:

	Year Ended December 31,
	2010			2009
Balance at beginning of period	$	(1,688	)	$	(1,964	)
Realized and unrealized gains (losses)-
Reclassified into interest expense for settled contracts		2,112			784
Included in other comprehensive income (loss)		(424	)		(508	)
Balance at end of period	$	—		$	(1,688	)

We generally apply fair value techniques on a non-recurring basis associated with (1) valuing the potential impairment loss related to goodwill and (2) valuing potential impairment loss related to long-lived assets.

See Note 17 for additional information on our derivative instruments.