INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Investments

The following table summarizes, by major security type, the Company's investments as of September 30, 2014 (in thousands): 

	Cost		Gross  Unrealized  Gains		Gross  Unrealized Losses			Fair Value
Available for sale securities:
Short-term investments:
Foreign government securities	$	189,491	$	24	$	—		$	189,515
U.S. government securities	650,518		2		(7		)	650,513
U.S. commercial paper	182,788		5		(163		)	182,630
U.S. government agency securities	170,708		1		(14		)	170,695
Total short-term investments	$	1,193,505	$	32	$	(184	)	$	1,193,353
Long-term investments:
U.S. government securities	$	232,951	$	—	$	(960	)	$	231,991
U.S. corporate debt securities	1,045,353		178		(1,754		)	1,043,777
U.S. government agency securities	70,257		12		(23		)	70,246
Ctrip corporate debt securities	500,000		—		(20,500		)	479,500
Ctrip equity securities	150,914		—		(11,246		)	139,668
Total long-term investments	$	1,999,475	$	190	$	(34,483	)	$	1,965,182

The following table summarizes, by major security type, the Company's investments as of December 31, 2013 (in thousands): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
Short-term investments:
Foreign government securities	$	4,019,530	$	233	$	(356	)	$	4,019,407
U.S. government securities	1,443,083		250		(20		)	1,443,313
Total	$	5,462,613	$	483	$	(376	)	$	5,462,720