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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value

The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the Consolidated Balance Sheets with the exception of the interest rate swap, which is measured at fair value:

									Fair Value Measurements at December 31, 2018
			Total						Level 1						Level 2						Level 3
Assets
Cash equivalents:
Money market fund deposits and term deposits			$	180,965					$	180,965					$	—					$	—
U.S. Treasury and agency obligations			6,495						6,495						—						—
Commercial paper			78,948						—						78,948						—
Short-term investments:
U.S. Treasury and agency obligations			116,800						116,800						—						—
Corporate bonds			227,009						227,009						—						—
Commercial paper			156,321						—						156,321						—
Long-term investments and other assets:
Corporate bonds			3,859						3,859						—						—
Auction rate securities			847						—						—						847
Interest rate swap			31						—						31						—
Total assets			$	771,275					$	535,128					$	235,300					$	847
Liabilities
Long-term notes			$	45,378					$	—					$	45,378					$	—
Contingent purchase consideration			898						—						—						898
Total liabilities			$	46,276					$	—					$	45,378					$	898

									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 swap			16						—						16						—
Total assets			$	633,110					$	632,078					$	16					$	1,016
Liabilities
Long-term notes			$	48,982					$	—					$	48,982					$	—
Contingent purchase consideration			902						—						—						902
Total liabilities			$	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:

						2018						2017						2016
Auction rate securities
Balance, January 1						$	1,016					$	1,144					$	1,136
Period transactions						(207)						—						—
Change in fair value						38						(128)						8
Balance, December 31						$	847					$	1,016					$	1,144
Contingent purchase consideration
Balance, January 1						$	902					$	—					$	20
Period transactions						—						902						(21)
Change in fair value						48						—						1
Foreign exchange adjustment						(52)						—						—
Balance, December 31						$	898					$	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:

						2018						2017						2016
Auction rate securities
Balance, January 1						$	1,016					$	1,144					$	1,136
Period transactions						(207)						—						—
Change in fair value						38						(128)						8
Balance, December 31						$	847					$	1,016					$	1,144
Contingent purchase consideration
Balance, January 1						$	902					$	—					$	20
Period transactions						—						902						(21)
Change in fair value						48						—						1
Foreign exchange adjustment						(52)						—						—
Balance, December 31						$	898					$	902					$	—

Maturities of Debt Securities

The following table presents the effective maturity dates of debt investments as of December 31, 2018 and December 31, 2017:

			December 31, 2018																		December 31, 2017
			Book Value						Fair Value						Book Value						Fair Value
Investment maturity
Held-to-maturity
Less than 1 year			$	585,875					$	585,573					$	206,257					$	206,161
1 through 5 years			3,859						3,859						—						—
Total			$	589,734					$	589,432					$	206,257					$	206,161
Available-for-sale
Greater than 5 years			$	847					$	847					$	1,012					$	1,016

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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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