Fair Value Measurements

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

Note 7—Fair Value Measurements:

For certain of the Company’s financial instruments and account groupings, including cash and cash equivalents, accounts receivable, accounts payable, accrued wages and other employee costs, unearned revenue, and other accrued liabilities, the carrying value approximates the fair value of these instruments and groupings.

Listed below are the Company’s assets and liabilities, and their respective fair values, that are measured at fair value on a recurring basis. For the Company’s short-term investments and marketable securities, fair value was determined based on the closing price reported on the active market on which the individual securities are traded. There were no transfers between levels during the nine months ended September 30, 2011.

	Quoted Market Prices (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2011:
Short-term investments:
Short-term municipal bond fund	$	20,520	$	—	$	—	$	20,520
Commercial paper		13,971		—		—		13,971
Corporate notes and bonds		42,096		—		—		42,096
Marketable securities:
Corporate notes and bonds		76,325		—		—		76,325
U.S. government agencies		13,154		—		—		13,154
Total	$	166,066	$	—	$	—	$	166,066
As of December 31, 2010:
Short-term investments:
Short-term municipal bond fund	$	20,275	$	—	$	—	$	20,275
Total	$	20,275	$	—	$	—	$	20,275

As of September 30, 2011, the Company did not have any financial assets or liabilities that were measured at fair value on a non-recurring basis.

The carrying amounts and fair values of financial instruments for which the fair value option was not elected were as follows:

	September 30, 2011				December 31, 2010
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Cash and cash equivalents	$	189,741	$	189,741	$	376,951	$	376,951
Long-term debt	$	184,695	$	232,300	$	178,107	$	239,533

The fair value of long-term debt was estimated based on the quoted market price for the debt.