Cash, Cash Equivalents, and Investments (Tables)

6 Months Ended

Jun. 30, 2013

Cash And Cash Equivalents [Abstract]

Components of Cash, Cash Equivalents, and Investments

Cash, cash equivalents, and investments consisted of the following (in thousands):

	June 30, 2013		December 31, 2012
Cash	$	34,467	$	34,986
Cash equivalents		12,947		5,098
Money market instruments		460		5,076
Cash and cash equivalents		47,874		45,160
Corporate bonds		80,386		46,001
Asset-backed securities		26,910		17,666
Municipal bonds		14,443		16,224
Sovereign bonds		7,383		3,986
Commercial paper		3,000		—
Corporate stock		1,669		2,131
Agency bonds		1,498		7,482
Covered bonds		—		5,618
Treasury bills		—		5,997
Short-term investments		135,289		105,105
Corporate bonds		109,780		100,072
Treasury bills		52,415		36,276
Asset-backed securities		41,266		34,710
Sovereign bonds		23,052		10,606
Municipal bonds		14,140		17,846
Agency bonds		—		29,441
Covered bonds		—		5,564
Limited partnership interest (accounted for using cost method)		2,455		3,740
Long-term investments		243,108		238,255
	$	426,271	$	388,520

Summary of Available-for-Sale Investments

The following tables summarize the Company’s available-for-sale investments as of June 30, 2013 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Short-term:
Corporate bonds	$	80,547	$	119	$	(280	)	$	80,386
Asset-backed securities		27,076		6		(172	)		26,910
Municipal bonds		14,416		28		(1	)		14,443
Sovereign bonds		7,396		—		(13	)		7,383
Commercial paper		3,000		—		—			3,000
Agency bonds		1,498		—		—			1,498
Long-term:
Corporate bonds		109,785		373		(378	)		109,780
Treasury bills		52,487		—		(72	)		52,415
Asset-backed securities		41,539		6		(279	)		41,266
Sovereign bonds		23,199		17		(164	)		23,052
Municipal bonds		14,110		62		(32	)		14,140
	$	375,053	$	611	$	(1,391	)	$	374,273

Gross Unrealized Losses and Fair Values for Available-for-Sale Investments

The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of June 30, 2013 (in thousands):

	Unrealized Loss Position For:
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	107,235	$	(658	)	$	—	$	—		$	107,235	$	(658	)
Sovereign bonds		23,007		(177	)		—		—			23,007		(177	)
Municipal bonds		5,846		(33	)		—		—			5,846		(33	)
Asset- backed securities		59,180		(449	)		1,570		(2	)		60,750		(451	)
Treasury bills		50,617		(72	)		—		—			50,617		(72	)
	$	245,885	$	(1,389	)	$	1,570	$	(2	)	$	247,455	$	(1,391	)

Effective Maturity Dates of Available-for-Sale Investments

The following table presents the effective maturity dates of the Company’s available-for-sale investments as of June 30, 2013 (in thousands):

	<1 Year		1-2 Years		2-3 Years		3-4 Years		4-5 Years		Total
Corporate bonds	$	80,386	$	48,477	$	54,059	$	6,729	$	515	$	190,166
Asset-backed securities		26,910		35,072		6,194		—		—		68,176
Treasury bills		—		29,870		22,545		—		—		52,415
Sovereign bonds		7,383		11,263		10,907		—		882		30,435
Municipal bonds		14,443		8,817		2,337		2,491		495		28,583
Commercial paper		3,000		—		—		—		—		3,000
Agency bonds		1,498		—		—		—		—		1,498
	$	133,620	$	133,499	$	96,042	$	9,220	$	1,892	$	374,273