Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair value of marketable securities
Available-for-sale securities, current	$ 45,540	$ 1,401,145
Total marketable investment securities	131,157us-gaap_MarketableSecurities	1,478,115us-gaap_MarketableSecurities
Transfer of investments from Level 1 to Level 2	0
Transfer of investments from Level 2 to Level 1	0
U.S. Treasury and agency securities
Fair value of marketable securities
Available-for-sale securities, current	62,777	58,254
Commercial paper
Fair value of marketable securities
Available-for-sale securities, current	11,277	65,696
Corporate securities
Fair value of marketable securities
Available-for-sale securities, current	1,017	1,247,403
Other
Fair value of marketable securities
Available-for-sale securities, current	17,194	55,788
Equity Securities
Fair value of marketable securities
Available-for-sale securities, current	38,892	50,974
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash equivalents (including restricted)	232,663	6,605,274
Total marketable investment securities	131,157	1,478,115
Fair value measurements on recurring basis \| Total \| U.S. Treasury and agency securities
Fair value of marketable securities
Available-for-sale securities, current	62,777	58,254
Fair value measurements on recurring basis \| Total \| Commercial paper
Fair value of marketable securities
Available-for-sale securities, current	11,277	65,696
Fair value measurements on recurring basis \| Total \| Corporate securities
Fair value of marketable securities
Available-for-sale securities, current	1,017	1,247,403
Fair value measurements on recurring basis \| Total \| Other
Fair value of marketable securities
Debt security	17,194	55,788
Fair value measurements on recurring basis \| Total \| Equity Securities
Fair value of marketable securities
Equity securities	38,892	50,974
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	37,675	258,281
Total marketable investment securities	86,142	93,684
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Available-for-sale securities, current	47,250	42,710
Fair value measurements on recurring basis \| Level 1 \| Equity Securities
Fair value of marketable securities
Equity securities	38,892	50,974
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	194,988	6,346,993
Total marketable investment securities	45,015	1,384,431
Fair value measurements on recurring basis \| Level 2 \| U.S. Treasury and agency securities
Fair value of marketable securities
Available-for-sale securities, current	15,527	15,544
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Available-for-sale securities, current	11,277	65,696
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Available-for-sale securities, current	1,017	1,247,403
Fair value measurements on recurring basis \| Level 2 \| Other
Fair value of marketable securities
Debt security	$ 17,194	$ 55,788

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

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