6)	Fair Value Measurements

In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model.

The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value:


Level 1		Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.
Level 2		Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments or securities or derivative contracts that are valued using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.
Level 3		Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the Company categorizes such assets and liabilities based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset.

Assets and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2014, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2014		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	$	129,092	$	129,092	$	—	$	—
Bankers acceptance drafts		131		—		131		—
Corporate obligations		700		—		700		—
Available-for-sale securities:
Time deposits and certificates of deposit		20,948		—		20,948		—
Asset-backed securities		75,674		—		75,674		—
Bankers acceptance drafts		82		—		82		—
Corporate obligations		88,689		—		88,689		—
Municipal bonds		3,353		—		3,353		—
U.S. agency obligations		98,049		—		98,049		—
Derivatives — currency forward contracts		2,110		—		2,110		—

Total assets	$	418,828	$	129,092	$	289,736	$	—

Liabilities:
Derivatives — currency forward contracts	$	—	$	—	$	—	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	129,923	$	129,092	$	831	$	—
Short-term investments		129,594		—		129,594		—
Other current assets		2,110		—		2,110		—

	$	261,627	$	129,092	$	132,535	$	—

Long-term investments	$	157,201	$	—	$	157,201	$	—

Liabilities:
Other current liabilities	$	—	$	—	$	—	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $167,517 and non-negotiable time deposits of $7,997 as of December 31, 2014.

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


			Fair Value Measurements at Reporting Date Using
Description	December 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	$	38,166	$	38,166	$	—	$	—
Time deposits and certificates of deposit		7,050		—		7,050		—
Bankers acceptance drafts		32		—		32		—
Commercial paper		3,350		—		3,350		—
Trading securities:
Mutual funds		1,000		1,000		—		—
Available-for-sale securities:
Time deposits and certificates of deposit		65,043		—		65,043		—
Bankers acceptance drafts		491		—		491		—
Commercial paper		53,434		—		53,434		—
Corporate obligations		18,351		—		18,351		—
U.S. agency obligations		222,801		—		222,801		—
Derivatives — currency forward contracts		920		—		920		—

Total assets	$	410,638	$	39,166	$	371,472	$	—

Liabilities:
Derivatives — currency forward contracts	$	656	$	—	$	656	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	48,598	$	38,166	$	10,432	$	—
Short-term investments		300,715		1,000		299,715		—
Other current assets		920		—		920		—

	$	350,233	$	39,166	$	311,067	$	—

Long-term investments	$	60,405	$	—	$	60,405	$	—

Liabilities:
Other current liabilities	$	656	$	—	$	656	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $234,675 and non-negotiable time deposits of $5,629 as of December 31, 2013.

Money Market Funds

Money market funds are cash and cash equivalents, and are classified within Level 1 of the fair value hierarchy.

Trading Securities

As of December 31, 2013, trading securities consisted of certain U.S. and international equity mutual funds and government agency fixed income mutual funds.

Available-For-Sale Investments

As of December 31, 2014, available-for-sale investments consisted of time deposits and drafts denominated in the Euro currency, certificates of deposit, asset-backed securities (which include auto loans, credit card receivables and equipment trust receivables), corporate obligations, U.S. treasury obligations and U.S. agency obligations. As of December 31, 2013, available-for-sale investments consisted of time deposits and drafts denominated in the Euro currency, commercial paper, certificates of deposit, corporate obligations, and U.S. agency obligations.

The Company measures its debt and equity investments at fair value. The Company’s available-for-sale investments are classified within Level 1 and Level 2 of the fair value hierarchy.

Derivatives

As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. The forward foreign currency exchange contracts are valued using broker quotations, or market transactions and are classified within Level 2 of the fair value hierarchy.