	September 30, 2013										December 31, 2012
	Fair Value Hierarchy										Fair Value Hierarchy
(in thousands)	Total		Level 1			Level 2			Level 3		Total		Level 1			Level 2			Level 3
Assets(1):
Cash and cash equivalents	$	19,114	$	19,114	(2)	$	—		$	—	$	14,457	$	14,457	(2)	$	—		$	—
Marketable securities, current	135,098		—			135,098		(3)	—		102,439		—			102,439		(3)
Deferred compensation trusts	81,350		81,350		(4)	—			—		80,842		80,842		(4)	—			—
Marketable securities, noncurrent	281,999		—			281,999		(5)	—		318,355		—			318,355		(5)	—
Derivative assets(6)
Commodity contracts	219		—			219			—		95		—			95			—
Foreign currency contracts	805		—			805			—		640		—			640			—

Liabilities(1):
Derivative liabilities(6)
Commodity contracts	$	290	$	—		$	290		$	—	$	28	$	—		$	28		$	—
Foreign currency contracts	3,344		—			3,344			—		2,151		—			2,151			—

(1) The company measures and reports assets and liabilities at fair value utilizing pricing information received from third parties. The company performs procedures to verify the reasonableness of pricing information received for significant assets and liabilities classified as Level 2.

(2) Consists primarily of registered money market funds valued at fair value. These investments represent the net asset value of the shares of such funds as of the close of business at the end of the period.

(3) Consists of investments in U.S. agency securities, U.S. Treasury securities, corporate debt securities, commercial paper and other debt securities with maturities of less than one year that are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets.

(4) Consists primarily of registered money market funds and an equity index fund valued at fair value. These investments, which are trading securities, represent the net asset value of the shares of such funds as of the close of business at the end of the period.

(5) Consists of investments in U.S. agency securities, U.S. Treasury securities, corporate debt securities and other debt securities with maturities ranging from one year to three years that are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets.

(6) See Note 8 for the classification of commodity contracts and foreign currency contracts on the Condensed Consolidated Balance Sheet. Commodity contracts and foreign currency contracts are estimated using standard pricing models with market-based inputs, which take into account the present value of estimated future cash flows.

		September 30, 2013				December 31, 2012
	Fair Value	Carrying		Fair		Carrying		Fair
(in thousands)	Hierarchy	Value		Value		Value		Value
Assets:
Cash(1)	Level 1	$	1,604,552	$	1,604,552	$	1,343,866	$	1,343,866
Cash equivalents(2)	Level 2	913,904		913,904		796,218		796,218
Marketable securities, current(3)	Level 2	22,812		22,812		34,688		34,688
Notes receivable, including noncurrent portion(4)	Level 3	25,836		25,836		34,471		34,471
Liabilities:
3.375% Senior Notes(5)	Level 2	$	496,494	$	493,992	$	496,164	$	527,219
1.5% Convertible Senior Notes(5)	Level 2	18,398		47,510		18,472		39,392
5.625% Municipal Bonds(5)	Level 2	—		—		17,795		17,878
Other borrowings(6)	Level 2	7,035		7,035		—		—
Notes payable, including noncurrent portion(7)	Level 3	—		—		8,566		8,566

(1) Cash consists of bank deposits. Carrying amounts approximate fair value.

(2) Cash equivalents consist of held-to-maturity time deposits with maturities of three months or less at the date of purchase. The carrying amounts of these time deposits approximate fair value because of the short-term maturity of these instruments.

(3) Marketable securities, current consist of held-to-maturity time deposits with original maturities greater than three months that will mature within one year. The carrying amounts of these time deposits approximate fair value because of the short-term maturity of these instruments. Amortized cost is not materially different from the fair value.

(4) Notes receivable are carried at net realizable value which approximates fair value. Factors considered by the company in determining the fair value include the credit worthiness of the borrower, current interest rates, the term of the note and any collateral pledged as security. Notes receivable are periodically assessed for impairment.

(5) The fair value of the 3.375% Senior Notes, 1.5% Convertible Senior Notes and 5.625% Municipal Bonds are estimated based on quoted market prices for similar issues. During the first nine months of 2013, the company redeemed its 5.625% Municipal Bonds at a price of 100% of their principal amount.

(6) Other borrowings represent amounts outstanding under a short-term credit facility. The carrying amount of borrowings under this credit facility approximates fair value because of the short-term maturity.

(7) Notes payable consist primarily of equipment loans with banks at various interest rates with maturities ranging from less than one year to four years. The carrying value of notes payable approximates fair value. Factors considered by the company in determining the fair value include the company’s current credit rating, current interest rates, the term of the note and any collateral pledged as security. During the first nine months of 2013, the company paid off the remaining balances of various notes payable that were assumed in connection with the 2012 acquisition of an equipment company.