Cash and cash equivalents cash at carrying value.

No definition available.

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- Definition

Cash unrealized gain.

+ References

No definition available.

+ Details

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- Definition

Cash unrealized loss.

+ References

No definition available.

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- Definition

Long term marketable securities cash.

+ References

No definition available.

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- Definition

Short term marketable cash.

+ References

No definition available.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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-Publisher FASB

-Name FASB Staff Position (FSP)

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-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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- Definition

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

+ References

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

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-Topic 210

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

+ References

+ Details

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Subparagraph (SX 210.5-02.12)

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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	$ 585,909	$ 183,532
Unrealized Gains	31
Unrealized Losses	(207)
Fair Value	585,733	183,532
Cash and Cash Equivalents	367,515	183,532	93,133	31,364
Short-Term Marketable Securities	118,970
Long-Term Marketable Securities	99,248
Level 1 [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	356,512
Unrealized Gains
Unrealized Losses
Fair Value	356,512
Cash and Cash Equivalents	356,512
Short-Term Marketable Securities
Long-Term Marketable Securities
Level 1 [Member] \| Money Market Funds [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	215,052	69,000
Unrealized Gains
Unrealized Losses
Fair Value	215,052	69,000
Cash and Cash Equivalents	215,052	69,000
Short-Term Marketable Securities
Long-Term Marketable Securities
Level 2 [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	229,397
Unrealized Gains	31
Unrealized Losses	(207)
Fair Value	229,221
Cash and Cash Equivalents	11,003
Short-Term Marketable Securities	118,970
Long-Term Marketable Securities	99,248
Level 2 [Member] \| U.S. agency securities [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	13,634
Unrealized Gains	4
Unrealized Losses	(3)
Fair Value	13,635
Short-Term Marketable Securities	7,635
Long-Term Marketable Securities	6,000
Level 2 [Member] \| Commercial paper [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	48,710
Unrealized Gains	15
Unrealized Losses	(22)
Fair Value	48,703
Cash and Cash Equivalents	9,999
Short-Term Marketable Securities	38,704
Level 2 [Member] \| Corporate securities [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	162,050
Unrealized Gains	12
Unrealized Losses	(180)
Fair Value	161,882
Cash and Cash Equivalents	1,004
Short-Term Marketable Securities	67,630
Long-Term Marketable Securities	93,248
Level 2 [Member] \| Municipal securities [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost	5,003
Unrealized Losses	(2)
Fair Value	5,001
Short-Term Marketable Securities	5,001
Cash [Member]
Schedule of cash, cash equivalent and marketable securities
Amortized Cost, Cash	141,460	114,532
Unrealized Gains, Cash
Unrealized Losses, Cash
Fair Value, Cash	141,460	114,532
Cash and Cash Equivalents, Cash	141,460	114,532
Short-Term Marketable Securities, Cash
Long-Term Marketable Securities, Cash