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Investments (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Fair Value of Investments Classified as Short-Term Available-for-Sale Investments

The fair value of investments classified as short-term consists of the following:

		Years Ended December 31,
Available-for-sale investments:		2015				2014
Time deposits and certificates of deposit		$	11,892			$	20,948
Bankers acceptance drafts			728				82
Asset-backed securities			124,997				75,674
Corporate obligations			165,109				88,689
Municipal bonds			8,355				3,353
U.S. agency obligations			119,582				98,049
		$	430,663			$	286,795

Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term Securities

The following table shows the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:

As of December 31, 2015:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit		$	11,893			$	—			$	(1	)		$	11,892
Bankers acceptance drafts			728				—				—				728
Asset-backed securities			125,271				—				(274	)			124,997
Corporate obligations			165,445				5				(341	)			165,109
Municipal bonds			8,346				13				(4	)			8,355
U.S. agency obligations			119,699				3				(120	)			119,582
		$	431,382			$	21			$	(740	)		$	430,663

As of December 31, 2014:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit		$	20,949			$	—			$	(1	)		$	20,948
Bankers acceptance drafts			82				—				—				82
Asset-backed securities			75,778				5				(109	)			75,674
Corporate obligations			88,871				3				(185	)			88,689
Municipal bonds			3,357				—				(4	)			3,353
U.S. agency obligations			98,051				16				(18	)			98,049
		$	287,088			$	24			$	(317	)		$	286,795

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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- References

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- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

+ References

No definition available.

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