INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The following table summarizes, by major security type, the Company's investments as of December 31, 2015 (in thousands): 

	Cost		Gross  Unrealized  Gains		Gross  Unrealized Losses			Fair Value
Short-term investments:
Foreign government securities	$	395,404	$	497	$	(104	)	$	395,797
U.S. government securities	457,001		—		(507		)	456,494
Corporate debt securities	305,654		25		(419		)	305,260
Commercial paper	11,688		—		—			11,688
U.S. government agency securities	2,009		—		(2		)	2,007
Total short-term investments	$	1,171,756	$	522	$	(1,032	)	$	1,171,246
Long-term investments:
Foreign government securities	$	718,947	$	1,367	$	(683	)	$	719,631
U.S. government securities	580,155		277		(1,982		)	578,450
Corporate debt securities	4,294,282		1,273		(18,941		)	4,276,614
U.S. municipal securities	1,080		3		—			1,083
Ctrip convertible debt securities	1,250,000		158,600		(30,050		)	1,378,550
Ctrip equity securities	630,311		346,724		—			977,035
Total long-term investments	$	7,474,775	$	508,244	$	(51,656	)	$	7,931,363

The following table summarizes, by major security type, the Company's investments as of June 30, 2016 (in thousands): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Short-term investments:
Foreign government securities	$	287,229	$	94	$	(211	)	$	287,112
U.S. government securities	427,344		194		(3		)	427,535
Corporate debt securities	949,907		1,382		(78		)	951,211
Commercial paper	8,012		—		(5		)	8,007
U.S. government agency securities	3,376		1		—			3,377
Total short-term investments	$	1,675,868	$	1,671	$	(297	)	$	1,677,242
Long-term investments:
Foreign government securities	$	641,671	$	4,766	$	—		$	646,437
U.S. government securities	541,307		5,923		—			547,230
Corporate debt securities	4,535,904		47,999		(556		)	4,583,347
U.S. municipal securities	1,064		10		—			1,074
U.S. government agency securities	1,000		—		—			1,000
Ctrip convertible debt securities	1,250,000		92,975		(36,500		)	1,306,475
Ctrip equity securities	630,311		238,540		—			868,851
Total long-term investments	$	7,601,257	$	390,213	$	(37,056	)	$	7,954,414