Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilites Measured At Fair Value

The following tables present information about our assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015, and indicate the fair value hierarchy of the valuation techniques we utilized to determine such fair value.

		Fair Value Measurement at September 30, 2016
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Institutional money market funds	$	83,864	$	—	$	83,864	$	—
Cash equivalents	Commercial paper	$	96,765	$	—	$	96,765	$	—
Cash equivalents	Corporate bonds	$	6,003	$	—	$	6,003	$	—
Cash equivalents	Municipal bonds	$	93,659	$	—	$	93,659	$	—
Cash equivalents	Bank certificates of deposit	$	1,750	$	—	$	1,750	$	—
Cash equivalents	Other government-related obligations	$	26,002	$	—	$	26,002	$	—
Marketable securities	Mutual funds	$	13,421	$	13,421	$	—	$	—
Marketable securities	Commercial paper	$	141,327	$	—	$	141,327	$	—
Marketable securities	Corporate bonds	$	181,801	$	—	$	181,801	$	—
Marketable securities	Municipal bonds	$	61,647	$	—	$	61,647	$	—
Marketable securities	Other government-related obligations	$	137,910	$	—	$	137,910	$	—
Marketable securities	Bank certificates of deposit	$	13,001	$	—	$	13,001	$	—
Marketable securities	Equity securities	$	1,775	$	1,775	$	—	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	50,320	$	—	$	50,320	$	—
Other assets	Foreign exchange forward contracts	$	31,122	$	—	$	31,122	$	—
Other current liabilities	Foreign exchange forward contracts	$	34,944	$	—	$	34,944	$	—
Other liabilities	Foreign exchange forward contracts	$	38,392	$	—	$	38,392	$	—
Prepaid expenses and other current assets	Interest rate contracts	$	229	$	—	$	229	$	—
Other current liabilities	Interest rate contracts	$	946	$	—	$	946	$	—
Other liabilities	Interest rate contracts	$	797	$	—	$	797	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	81,848	$	—	$	—	$	81,848
Contingent consideration	Acquisition-related contingent consideration	$	126,056	$	—	$	—	$	126,056

		Fair Value Measurement at December 31, 2015
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Institutional money market funds	$	179,898	$	—	$	179,898	$	—
Cash equivalents	Commercial paper	$	192,418	$	—	$	192,418	$	—
Cash equivalents	Corporate bonds	$	12,250	$	—	$	12,250	$	—
Cash equivalents	Municipal bonds	$	60,001	$	—	$	60,001	$	—
Cash equivalents	Other government-related obligations	$	31,549	$	—	$	31,549	$	—
Cash equivalents	Bank certificates of deposit	$	27,000	$	—	$	27,000	$	—
Marketable securities	Mutual funds	$	8,817	$	8,817	$	—	$	—
Marketable securities	Commercial paper	$	61,978	$	—	$	61,978	$	—
Marketable securities	Corporate bonds	$	120,499	$	—	$	120,499	$	—
Marketable securities	Municipal bonds	$	27,110	$	—	$	27,110	$	—
Marketable securities	Other government-related obligations	$	156,500	$	—	$	156,500	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	91,745	$	—	$	91,745	$	—
Other assets	Foreign exchange forward contracts	$	66,309	$	—	$	66,309	$	—
Other current liabilities	Foreign exchange forward contracts	$	5,648	$	—	$	5,648	$	—
Other liabilities	Foreign exchange forward contracts	$	4,773	$	—	$	4,773	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	55,804	$	—	$	—	$	55,804
Contingent consideration	Acquisition-related contingent consideration	$	121,424	$	—	$	—	$	121,424

Schedule Of Acquisition-Related Contingent Consideration

The following table represents a roll-forward of our acquisition-related contingent consideration:

	Nine months ended
	September 30, 2016
Balance at December 31, 2015	$	(177,228	)
Changes in fair value	(30,676		)
Balance at September 30, 2016	$	(207,904	)