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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value

The following table presents information about the Company's assets and liabilities measured at fair value:

			Fair Value Measurements at September 30, 2018
			Total						Level 1						Level 2						Level 3
Assets
Cash equivalents:
Money market fund deposits and term deposits			$	316,442					$	316,442					$	—					$	—
U.S. Treasury and agency obligations			8,999						8,999						—						—
Commercial paper			89,312						—						89,312						—
Short-term investments
U.S. Treasury and agency obligations			113,094						113,094						—						—
Corporate bonds			196,856						196,856						—						—
Commercial paper			164,255						—						164,255						—
Long-term investments and other assets:
Corporate bonds			13,771						13,771						—						—
Auction rate securities			967						—						—						967
Interest rate swap			13						—						13						—
Total			$	903,709					$	649,162					$	253,580					$	967
Liabilities
Long-term debt			$	46,285					$	—					$	46,285					$	—
Contingent purchase consideration			902						—						—						902
Total			$	47,187					$	—					$	46,285					$	902
			Fair Value Measurements at December 31, 2017
			Total						Level 1						Level 2						Level 3
Assets
Cash equivalents
Money market fund deposits and term deposits			$	425,917					$	425,917					$	—					$	—
Short-term investments
U.S. Treasury and agency obligations			41,217						41,217						—						—
Corporate bonds			131,048						131,048						—						—
Commercial paper			33,896						33,896						—						—
Long-term investments and other assets:
Auction rate securities			1,016						—						—						1,016
Interest rate swaps			16						—						16						—
Total			$	633,110					$	632,078					$	16					$	1,016
Liabilities
Long-term debt			$	48,982					$	—					$	48,982					$	—
Contingent purchase consideration			902						—						—						902
Total			$	49,884					$	—					$	48,982					$	902

Fair Value, Assets Measured on Recurring Basis

The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:

			Three Months Ended September 30,																		Nine Months Ended September 30,
			2018						2017						2018						2017
Auction rate securities
Balance, beginning of period			$	1,174					$	1,148					$	1,016					$	1,144
Period transactions			(207)						(138)						(207)						(138)
Change in fair value and accretion			—						2						158						6
Balance, end of period			$	967					$	1,012					$	967					$	1,012
Contingent purchase consideration
Balance, beginning of period			$	902					$	—					$	902					$	—
Balance, end of period			$	902					$	—					$	902					$	—

Fair Value, Liabilities Measured on Recurring Basis

The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:

			Three Months Ended September 30,																		Nine Months Ended September 30,
			2018						2017						2018						2017
Auction rate securities
Balance, beginning of period			$	1,174					$	1,148					$	1,016					$	1,144
Period transactions			(207)						(138)						(207)						(138)
Change in fair value and accretion			—						2						158						6
Balance, end of period			$	967					$	1,012					$	967					$	1,012
Contingent purchase consideration
Balance, beginning of period			$	902					$	—					$	902					$	—
Balance, end of period			$	902					$	—					$	902					$	—

Schedule of Effective Maturity Dates of Held To Maturity Investments

The following table presents the effective maturity dates of held-to-maturity debt investments as of September 30, 2018 and December 31, 2017:

			September 30, 2018																		December 31, 2017
			Book Value						Fair Value						Book Value						Fair Value
Investment maturity
Less than 1 year			$	572,815					$	572,516					$	206,161					$	206,161
1 through 5 years			13,776						13,771						—						—
Greater than 5 years			844						967						1,016						1,016
Total			$	587,435					$	587,254					$	207,177					$	207,177

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- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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