Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Fair Value of 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:


	September 30, 2013		December 31, 2012
Available-for-sale investments:
Bankers’ acceptance drafts	$	330	$	242
Time deposits		77,577		52
Commercial paper and corporate obligations		81,308		—
U.S. treasury obligations		—		13,054
U.S. agency obligations		205,702		313,514

		364,917		326,862
Trading investments:
Mutual funds		959		791

	$	365,876	$	327,653

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:


	September 30, 2013		December 31, 2012
Available-for-sale investments:
Time deposits	$	56	$	—
U.S. agency obligations		5,127		12,158

	$	5,183	$	12,158

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 September 30, 2013:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Bankers’ acceptance drafts	$	330	$	—	$	—		$	330
Time deposits		77,575		5		(3	)		77,577
Commercial paper and corporate obligations		81,300		10		(2	)		81,308
U.S. agency obligations		205,639		63		—			205,702

	$	364,844	$	78	$	(5	)	$	364,917

Long-term investments:
Time deposits	$	56	$	—	$	—		$	56
U.S. agency obligations		5,122		5		—			5,127

U.S. agency obligations	$	5,178	$	5	$	—		$	5,183


As of December 31, 2012:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits	$	52	$	—	$	—		$	52
Bankers’ acceptance drafts		242		—		—			242
U.S. treasury obligations		13,045		9		—			13,054
U.S. agency obligations		313,262		258		(6	)		313,514

	$	326,601	$	267	$	(6	)	$	326,862

Long-term investments:
U.S. agency obligations	$	12,156	$	2	$	—		$	12,158

- 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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