Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair value of marketable securities
Debt securities	$ 1,401,145	$ 4,117,326
Total marketable investment securities	1,478,115us-gaap_MarketableSecurities	4,181,228us-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
Debt securities	58,254
Commercial paper
Fair value of marketable securities
Debt securities	65,696	381,515
Corporate securities
Fair value of marketable securities
Debt securities	1,247,403	3,520,092
Other (including restricted)
Fair value of marketable securities
Debt security	55,788	253,098
Equity Securities
Fair value of marketable securities
Equity securities	50,974	26,523
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash equivalents (including restricted)	6,605,274	3,743,328
Total marketable investment securities	1,478,115	4,181,228
Fair value measurements on recurring basis \| Total \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	58,254
Fair value measurements on recurring basis \| Total \| Commercial paper
Fair value of marketable securities
Debt securities	65,696	381,515
Fair value measurements on recurring basis \| Total \| Corporate securities
Fair value of marketable securities
Debt securities	1,247,403	3,520,092
Fair value measurements on recurring basis \| Total \| Other (including restricted)
Fair value of marketable securities
Debt security	55,788	253,098
Fair value measurements on recurring basis \| Total \| Equity Securities
Fair value of marketable securities
Equity securities	50,974	26,523
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	258,281	275,277
Total marketable investment securities	93,684	26,523
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	42,710
Fair value measurements on recurring basis \| Level 1 \| Equity Securities
Fair value of marketable securities
Equity securities	50,974	26,523
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	6,346,993	3,468,051
Total marketable investment securities	1,384,431	4,154,705
Fair value measurements on recurring basis \| Level 2 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	15,544
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	65,696	381,515
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	1,247,403	3,520,092
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security	$ 55,788	$ 253,098

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

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