FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets measured at fair value	$ 216,883	$ 329,506
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets measured at fair value	175,634	140,142
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets measured at fair value	392,517	469,648
U.S. Treasury Bills and Government Agency Securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	29,837	17,391
Corporate Bonds [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	25,510	19,059
Certificates of Deposit [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	2,882
U.S. Treasury Bills and Government Agency Securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	61,896	105,863
Commercial Paper [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	20,039	30,075
Corporate Bonds [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	38,356	11,216
Certificates of Deposit [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	4,886	5,429
Cash and Cash Equivalents [Member] \| Cash [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	147,338	136,804
Cash and Cash Equivalents [Member] \| Cash [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Cash and Cash Equivalents [Member] \| Cash [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	147,338	136,804
Cash and Cash Equivalents [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	50,000	74,991
Cash and Cash Equivalents [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Cash and Cash Equivalents [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	50,000	74,991
Cash and Cash Equivalents [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Cash and Cash Equivalents [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	11,997	22,495
Cash and Cash Equivalents [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	11,997	22,495
Cash and Cash Equivalents [Member] \| Money Market Accounts [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		38,000
Cash and Cash Equivalents [Member] \| Money Market Accounts [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		0
Cash and Cash Equivalents [Member] \| Money Market Accounts [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		38,000
Cash and Cash Equivalents [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		0
Cash and Cash Equivalents [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		3,082
Cash and Cash Equivalents [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		3,082
Cash and Cash Equivalents [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		0
Cash and Cash Equivalents [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		2,001
Cash and Cash Equivalents [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		2,001
Short-term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	12,898	71,756
Short-term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	48,998	34,107
Short-term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	61,896	105,863
Short-term Investments [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Short-term Investments [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	20,039	30,075
Short-term Investments [Member] \| Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	20,039	30,075
Short-term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Short-term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	38,356	11,216
Short-term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	38,356	11,216
Short-term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Short-term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	4,886	5,429
Short-term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	4,886	5,429
Long Term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,647	7,955
Long Term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	23,190	9,436
Long Term Investments [Member] \| U.S. Treasury Bills and Government Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	29,837	17,391
Long Term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Long Term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	25,510	19,059
Long Term Investments [Member] \| Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure	25,510	19,059
Long Term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure		0
Long Term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure		2,882
Long Term Investments [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Fair Value Disclosure		2,882
Other Current Assets [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative assets	0	0
Other Current Assets [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative assets	2,658	360
Other Current Assets [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative assets	2,658	360
Accrued Liabilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative liabilities	7	27
Accrued Liabilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative liabilities	714	4,174
Accrued Liabilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative liabilities	$ 721	$ 4,201

FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2012

Mar. 31, 2011

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Total assets measured at fair value

$ 216,883

$ 329,506

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Total assets measured at fair value

175,634

140,142

Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Total assets measured at fair value

392,517

469,648

U.S. Treasury Bills and Government Agency Securities [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

29,837

17,391

Corporate Bonds [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

25,510

19,059

Certificates of Deposit [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

2,882

U.S. Treasury Bills and Government Agency Securities [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

61,896

105,863

Commercial Paper [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

20,039

30,075

Corporate Bonds [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

38,356

11,216

Certificates of Deposit [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

4,886

5,429

Cash and Cash Equivalents [Member] | Cash [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

147,338

136,804

Cash and Cash Equivalents [Member] | Cash [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | Cash [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

147,338

136,804

Cash and Cash Equivalents [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

50,000

74,991

Cash and Cash Equivalents [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

50,000

74,991

Cash and Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

11,997

22,495

Cash and Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

11,997

22,495

Cash and Cash Equivalents [Member] | Money Market Accounts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

38,000

Cash and Cash Equivalents [Member] | Money Market Accounts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | Money Market Accounts [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

38,000

Cash and Cash Equivalents [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

3,082

Cash and Cash Equivalents [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

3,082

Cash and Cash Equivalents [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

Cash and Cash Equivalents [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

2,001

Cash and Cash Equivalents [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Cash and Cash Equivalents, Fair Value Disclosure

2,001

Short-term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

12,898

71,756

Short-term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

48,998

34,107

Short-term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

61,896

105,863

Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

20,039

30,075

Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

20,039

30,075

Short-term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

Short-term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

38,356

11,216

Short-term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

38,356

11,216

Short-term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

Short-term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

4,886

5,429

Short-term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

4,886

5,429

Long Term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

6,647

7,955

Long Term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

23,190

9,436

Long Term Investments [Member] | U.S. Treasury Bills and Government Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

29,837

17,391

Long Term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

Long Term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

25,510

19,059

Long Term Investments [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

25,510

19,059

Long Term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

Long Term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

2,882

Long Term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Available-for-sale Securities, Fair Value Disclosure

2,882

Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Derivative assets

Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Derivative assets

2,658

360

Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Derivative assets

2,658

360

Accrued Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]

Derivative liabilities

Accrued Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]

Derivative liabilities

714

4,174

Accrued Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]

Derivative liabilities

$ 721

$ 4,201

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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