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Investments (Tables)

3 Months Ended

Mar. 31, 2016

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:

		March 31, 2016				December 31, 2015
Available-for-sale investments:
Time deposits and certificates of deposit		$	23,005			$	11,892
Bankers’ acceptance drafts			1,646				728
Asset-backed securities			74,057				124,997
Corporate obligations			90,856				165,109
Municipal bonds			4,611				8,355
U.S. treasury obligations			4,360				—
U.S. agency obligations			110,233				119,582
		$	308,768			$	430,663

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

The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term available-for-sale investments:

As of March 31, 2016:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit		$	23,005			$	—			$	—			$	23,005
Bankers’ acceptance drafts			1,646				—				—				1,646
Asset-backed securities			74,068				27				(38	)			74,057
Corporate obligations			90,944				52				(140	)			90,856
Municipal bonds			4,604				9				(2	)			4,611
U.S. treasury obligations			4,355				5				—				4,360
U.S. agency obligations			110,216				24				(7	)			110,233
		$	308,838			$	117			$	(187	)		$	308,768

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

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- 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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- 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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