Investments (Tables)

12 Months Ended

Dec. 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:


	Years Ended December 31,
	2014		2013
Available-for-sale investments:
Time deposits and certificates of deposit	$	20,900	$	64,989
Bankers acceptance drafts		82		491
Commercial paper		—		53,434
Corporate obligations		24,020		18,351
Municipal bonds		2,099		—
U.S. agency obligations		82,493		162,450

		129,594		299,715
Trading securities:
Mutual funds (1)		—		1,000

	$	129,594	$	300,715

(1)	The mutual funds are associated with the Company’s supplemental defined contribution retirement obligations.

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

The fair value of long-term available-for-sale investments with maturities or estimated lives of more than one year consists of the following:


	Years Ended December 31,
	2014		2013
Time deposits and certificates of deposit	$	48	$	54
Asset-backed securities		75,674		—
Corporate obligations		64,669		—
Municipal bonds		1,254		—
U.S. agency obligations		15,556		60,351

	$	157,201	$	60,405

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

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


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of December 31, 2014:
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	20,901	$	—	$	(1	)	$	20,900
Bankers acceptance drafts		82		—		—			82
Corporate obligations		24,029		2		(11	)		24,020
Municipal bonds		2,100		—		(1	)		2,099
U.S. agency obligations		82,488		14		(9	)		82,493

	$	129,600	$	16	$	(22	)	$	129,594

Long-term investments:
Time deposits	$	48	$	—	$	—		$	48
Asset-backed securities		75,778		5		(109	)		75,674
Corporate obligations		64,842		1		(174	)		64,669
Municipal bonds		1,258		—		(4	)		1,254
U.S. agency obligations		15,563		2		(9	)		15,556

	$	157,489	$	8	$	(296	)	$	157,201


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of December 31, 2013:
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	64,983	$	10	$	(4	)	$	64,989
Bankers acceptance drafts		491		—		—			491
Commercial paper		53,429		5		—			53,434
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 and certificates of deposit	$	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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