Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair value of marketable securities
Total marketable investment securities	$ 893,579	$ 823,480
Debt security	731,700
Investments	1,071,473	1,028,207
Corporate Bonds
Fair value of marketable securities
Debt security	765,006	654,096
VRDNs
Fair value of marketable securities
Debt security	50,770	66,145
Other (including restricted)
Fair value of marketable securities
Debt security	49,368	46,951
Level 3
Fair value of marketable securities
Investments	0	0
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash equivalents (including restricted)	680,320	533,943
Total marketable investment securities	893,579	823,480
Fair value measurements on recurring basis \| Total \| Corporate Bonds
Fair value of marketable securities
Debt security	765,006	654,096
Fair value measurements on recurring basis \| Total \| VRDNs
Fair value of marketable securities
Debt security	50,770	66,145
Fair value measurements on recurring basis \| Total \| Other (including restricted)
Fair value of marketable securities
Debt security	49,368	46,951
Fair value measurements on recurring basis \| Total \| Equity securities - Strategic
Fair value of marketable securities
Equity security	28,435	56,288
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	48,234	23,621
Total marketable investment securities	28,435	56,288
Fair value measurements on recurring basis \| Level 1 \| Equity securities - Strategic
Fair value of marketable securities
Equity security	28,435	56,288
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	632,086	510,322
Total marketable investment securities	865,144	767,192
Fair value measurements on recurring basis \| Level 2 \| Corporate Bonds
Fair value of marketable securities
Debt security	765,006	654,096
Fair value measurements on recurring basis \| Level 2 \| VRDNs
Fair value of marketable securities
Debt security	50,770	66,145
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security	$ 49,368	$ 46,951

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Fair value portion 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.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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