Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair value of marketable securities
Total	$ 1,013,924	$ 994,498
Corporate Bonds
Fair value of marketable securities
Debt security	900,148	833,791
VRDNs
Fair value of marketable securities
Debt security	31,110	34,705
Other (including restricted)
Fair value of marketable securities
Debt security	49,419	92,389
Level 3
Fair value of marketable securities
Fair value of investments	0	0
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash equivalents (including restricted)	616,316	548,714
Total	1,013,924	994,498
Fair value measurements on recurring basis \| Total \| Corporate Bonds
Fair value of marketable securities
Debt security	900,148	833,791
Fair value measurements on recurring basis \| Total \| VRDNs
Fair value of marketable securities
Debt security	31,110	34,705
Fair value measurements on recurring basis \| Total \| Other (including restricted)
Fair value of marketable securities
Debt security	49,419	92,389
Fair value measurements on recurring basis \| Total \| Equity securities - Strategic
Fair value of marketable securities
Equity security	33,247	33,613
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	7,906	49,338
Total	33,247	33,613
Fair value measurements on recurring basis \| Level 1 \| Equity securities - Strategic
Fair value of marketable securities
Equity security	33,247	33,613
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	608,410	499,376
Total	980,677	960,885
Fair value measurements on recurring basis \| Level 2 \| Corporate Bonds
Fair value of marketable securities
Debt security	900,148	833,791
Fair value measurements on recurring basis \| Level 2 \| VRDNs
Fair value of marketable securities
Debt security	31,110	34,705
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security	$ 49,419	$ 92,389

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 investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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