Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis

Assets and liabilities of the Company are measured at fair value on a recurring basis as of March 31, 2013 and are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	Total March 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	85,863	$	85,863	$	—	$	—
Bankers’ acceptance drafts		136		—		136		—
Trading securities:
Mutual funds		813		813		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		93		—		93		—
U.S. treasury obligations		13,042		—		13,042		—
U.S. agency obligations		327,790		302,684		25,106		—
Derivatives – currency forward contracts		1,566		—		1,566		—
Total assets	$	429,303	$	389,360	$	39,943	$	—
Liabilities:
Derivatives – currency forward contracts	$	300	$	—	$	300	$	—
Reported as follows:
Assets:
Cash and cash equivalents(1)	$	85,999	$	85,863	$	136	$	—
Short-term investments		331,634		293,393		38,241		—
Other current assets		1,566		—		1,566		—
Total current assets	$	419,199	$	379,256	$	39,943	$	—
Long-term investments(2)	$	10,104	$	10,104	$	—	$	—
Liabilities:
Other current liabilities	$	300	$	—	$	300	$	—

(1) The cash and cash equivalent amounts presented in the table above do not include cash of $169,929 and non-negotiable time deposits of $10,780 as of March 31, 2013.

(2) The long-term investments presented in the table above do not include non-negotiable time deposits of $53 as of March 31, 2013.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2012 and are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	Total December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	51,291	$	51,291	$	—	$	—
Bankers acceptance drafts		16		—		16		—
Trading securities:
Mutual funds		791		791		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		242		—		242		—
U.S. treasury obligations		13,054		—		13,054		—
U.S. agency obligations		325,672		295,665		30,007		—
Derivatives – currency forward contracts		961		—		961		—
Total assets	$	392,027	$	347,747	$	44,280	$	—
Liabilities:
Derivatives – currency forward contracts	$	1,310	$	—	$	1,310	$	—
Reported as follows:
Assets:
Cash and cash equivalents(1)	$	51,307	$	51,291	$	16	$	—
Short-term investments(2)		327,601		284,298		43,303		—
Other current assets		961		—		961		—
Total current assets	$	379,869	$	335,589	$	44,280	$	—
Long-term investments	$	12,158	$	12,158	$	—	$	—
Liabilities:
Other current liabilities	$	1,310	$	—	$	1,310	$	—

(1) The cash and cash equivalent amounts presented in the table above do not include cash of $185,143 and non-negotiable time deposits of $51,138 as of December 31, 2012.

(2) The short-term investments presented in the table above do not include non-negotiable time deposits of $52 as of December 31, 2012.