Investments (Tables)

3 Months Ended

Mar. 31, 2014

Investments Debt And Equity Securities [Abstract]

Fair Value of Short-Term Available-for-Sale and Trading Investments

The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:


	March 31, 2014		December 31, 2013
Available-for-sale investments:
Bankers’ acceptance drafts	$	637	$	491
Time deposits		3,442		3,439
Commercial paper and certificates of deposit		127,524		114,984
Corporate obligations		16,826		18,351
U.S. agency obligations		158,084		162,450

		306,513		299,715
Trading investments:
Mutual funds		—		1,000

	$	306,513	$	300,715

Fair Value of Long-Term Available-for-Sale Investments

The fair value of long-term investments with maturities of more than one year consists of the following:


	March 31, 2014		December 31, 2013
Available-for-sale investments:
Time deposits	$	54	$	54
U.S. agency obligations		53,566		60,351

	$	53,620	$	60,405

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

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


As of March 31, 2014:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Bankers’ acceptance drafts	$	637	$	—	$	—		$	637
Time deposits		3,442		—		—			3,442
Commercial paper and certificates of deposit		127,514		14		(4	)		127,524
Corporate obligations		16,827		1		(2	)		16,826
U.S. agency obligations		158,044		48		(8	)		158,084

	$	306,464	$	63	$	(14	)	$	306,513

Long-term investments:
Time deposits	$	54	$	—	$	—		$	54
U.S. agency obligations		53,558		18		(10	)		53,566

	$	53,612	$	18	$	(10	)	$	53,620


As of December 31, 2013:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits	$	3,439	$	—	$	—		$	3,439
Bankers’ acceptance drafts		491		—		—			491
Commercial paper and certificates of deposit		114,973		15		(4	)		114,984
Corporate obligations		18,360		—		(9	)		18,351
U.S. agency obligations		162,430		22		(2	)		162,450

	$	299,693	$	37	$	(15	)	$	299,715

Long-term investments:
Time Deposits	$	54	$	—	$	—		$	54
U.S. agency obligations		60,374		9		(32	)		60,351

	$	60,428	$	9	$	(32	)	$	60,405

- 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.

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