Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Fair Value Of Financial Assets And Liabilities

		00000000000		00000000000		00000000000		00000000000
	Fair Value Measurements at September 30, 2011
	Total		Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents
Overnight deposits	$	36,493	$	36,493	$	0	$	0
Money market instruments		34,761		0		34,761		0
Total cash and cash equivalents	$	71,254	$	36,493	$	34,761	$	0
Available-for-sale securities
Short-term
Certificates of deposit	$	31,987	$	0	$	31,987	$	0
Commercial paper		39,685		0		39,685		0
Corporate securities		81,448		0		81,448		0
Long-term
Certificates of deposit		28,149		0		28,149		0
Corporate securities		69,073		0		69,073		0
U.S. Government agency securities		48,418		0		48,418		0
Total available-for-sale securities	$	298,760	$	0	$	298,760	$	0
Deferred compensation asset (1)		3,222		0		3,222		0
Forward foreign currency exchange contract asset (2)		1,538		0		1,538		0
Total assets	$	374,774	$	36,493	$	338,281	$	0
Liabilities:
Deferred compensation liability (3)	$	8,733	$	5,511	$	3,222	$	0
Forward foreign currency exchange contract liability (2)		926		0		926		0
Contingent acquisition consideration payable (4)		38,020		0		0		38,020
Asset retirement obligation (5)		2,947		0		0		2,947
Total liabilities	$	50,626	$	5,511	$	4,148	$	40,967

		000000000000000		000000000000000		000000000000000		000000000000000
	Fair Value Measurements at December 31, 2010
	Total		Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents
Overnight deposits	$	51,647	$	51,647	$	0	$	0
Money market instruments		36,432		0		36,432		0
Total cash and cash equivalents	$	88,079	$	51,647	$	36,432	$	0
Available-for-sale securities
Short-term
Certificates of deposit	$	29,845	$	0	$	29,845	$	0
Commercial paper		27,457		0		27,457		0
Corporate securities		80,186		0		80,186		0
U.S. Government agency securities		48,545		0		48,545		0
Long-term
Certificates of deposit		25,848		0		25,848		0
Corporate securities		72,329		0		72,329		0
U.S. Government agency securities		29,994		0		29,994		0
Total available-for-sale securities	$	314,204	$	0	$	314,204	$	0
Deferred compensation asset (1)		2,748		0		2,748		0
Forward foreign currency exchange contract asset (2)		1,496		0		1,496		0
Total assets	$	406,527	$	51,647	$	354,880	$	0
Liabilities:
Deferred compensation liability (3)	$	5,560	$	2,812	$	2,748	$	0
Forward foreign currency exchange contract liability (2)		1,673		0		1,673		0
Contingent acquisition consideration payable (4)		43,718		0		0		43,718
Total liabilities	$	50,951	$	2,812	$	4,421	$	43,718

(1) At September 30, 2011 and December 31, 2010, 96% and 97%, respectively, of the deferred compensation asset balance was included in other assets and the remainder of the balance was included in other current assets on the Company's Condensed Consolidated Balance Sheets.

(2) See Note 9 for further information regarding the Company's derivative instruments.

(3) At September 30, 2011 and December 31, 2010, 93% and 94%, respectively, of the deferred compensation liability balance was included in other long-term liabilities and the remainder was included in accounts payable and accrued liabilities on the Condensed Company's Consolidated Balance Sheets.

(4) At September 30, 2011 and December 31, 2010, 86% and 80%, respectively, of the contingent acquisition consideration payable was included in other long-term liabilities and 14% and 20%, respectively, was included in accounts payable and accrued liabilities.

(5) At September 30, 2011 the asset retirement obligation liability was included in other long-term liabilities.