Cash, Cash Equivalents, And Marketable Securities Schedule of Investments by contractual maturity (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 1,092,220
Unrealized gain on available for sale securities due within on year	59
Available-for-sale Securities, Gross Unrealized Gains	246
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	1,092,279
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	29,931
Unrealized gain on available for sale securities due in one through three years	187
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	30,118
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	1,122,151
Available-for-sale Securities, Fair Value Disclosure	$ 1,122,397

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.

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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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