Fair Value Measurements

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements. Our financial assets and liabilities carried at fair value measured on a recurring basis as of March 31, 2012 and December 31, 2011, consisted of the following (in thousands):

			Fair Value Measurements Using
	Total Fair		Quoted prices in		Significant other		Significant
	Value at		active markets		observable inputs		Unobservable inputs
Description	March 31, 2012		(Level 1)		(Level 2)		(Level 3)
Marketable securities (1)	$	3,064	$	3,064	$	—	$	—
			Fair Value Measurements Using
	Total Fair		Quoted prices in		Significant other		Significant
	Value at		active markets		observable inputs		Unobservable inputs
Description	December 31, 2011		(Level 1)		(Level 2)		(Level 3)
Marketable securities (1)	$	2,798	$	2,798	$	—	$	—

(1)    Our marketable securities, which consist entirely of available-for-sale equity securities, are valued using market prices in active markets. Level 1 instrument valuations are obtained from real-time quotes for transactions in active exchange markets involving identical assets.

During the three-month periods ended March 31, 2012 and 2011, we had losses of approximately $0 and $14,000, respectively, related to the measurement of non-financial assets at fair value on a nonrecurring basis subsequent to their initial recognition. 

The carrying amount of cash and cash equivalents, receivables, and trade payables approximates fair value because of the immediate, short-term maturity of these financial instruments. The carrying amount of long-term debt approximates fair value, as determined by borrowing rates estimated to be available to us for debt with similar terms and conditions. The fair value of assets and liabilities whose carrying value approximates fair value is determined using Level 2 inputs, with the exception of cash and cash equivalents (Level 1).