Investments (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

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

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


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	23,630	$	20,900
Asset-backed securities		155		—
Bankers’ acceptance drafts		222		82
Commercial paper		3,450		—
Corporate obligations		59,719		24,020
Municipal bonds		7,057		2,099
U.S. agency obligations		83,200		82,493

	$	177,433	$	129,594

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


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	—	$	48
Asset-backed securities		140,677		75,674
Corporate obligations		103,570		64,669
Municipal bonds		605		1,254
U.S. agency obligations		12,003		15,556

	$	256,855	$	157,201

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 June 30, 2015:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits and certificates of deposit	$	23,630	$	—	$	—		$	23,630
Asset-backed securities		256		—		(101	)		155
Bankers’ acceptance drafts		222		—		—			222
Commercial paper		3,449		1		—			3,450
Corporate obligations		59,735		7		(23	)		59,719
Municipal bonds		7,055		6		(4	)		7,057
U.S. agency obligations		83,176		25		(1	)		83,200

	$	177,523	$	39	$	(129	)	$	177,433

Long-term investments:
Asset-backed securities	$	140,695	$	50	$	(68	)	$	140,677
Corporate obligations		103,709		17		(156	)		103,570
Municipal bonds		615		—		(10	)		605
U.S. agency obligations		11,998		6		(1	)		12,003

	$	257,017	$	73	$	(235	)	$	256,855


As of December 31, 2014:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term 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 and certificates of deposit	$	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

- 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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