Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 5) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair value of marketable securities
Debt securities	$ 401,261	$ 2,131,745
US Treasury and agency securities
Fair value of marketable securities
Debt securities	56,754	58,254
Commercial paper
Fair value of marketable securities
Debt securities	11,792	68,556
Corporate securities
Fair value of marketable securities
Debt securities	169,526	1,496,044
Other (including restricted)
Fair value of marketable securities
Debt securities	57,330	192,607
Equity securities
Fair value of marketable securities
Equity securities	187,654	393,254
Total \| Commercial paper
Fair value of marketable securities
Debt securities	11,792
Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	11,792
Level 3 \| Corporate securities
Fair value of marketable securities
Debt securities	7,858
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash Equivalents (including restricted)	608,160	7,009,897
Subtotal	483,056	2,208,715
Derivative financial instruments	551,847	383,460
Total	1,034,903	2,592,175
Fair value measurements on recurring basis \| Total \| US Treasury and agency securities
Fair value of marketable securities
Debt securities	56,754	58,254
Fair value measurements on recurring basis \| Total \| Commercial paper
Fair value of marketable securities
Debt securities		68,556
Fair value measurements on recurring basis \| Total \| Corporate securities
Fair value of marketable securities
Debt securities	169,526	1,496,044
Fair value measurements on recurring basis \| Total \| Other (including restricted)
Fair value of marketable securities
Debt securities	57,330	192,607
Fair value measurements on recurring basis \| Total \| Equity securities
Fair value of marketable securities
Equity securities	187,654	393,254
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash Equivalents (including restricted)	64,852	274,123
Subtotal	239,524	435,964
Total	239,524	435,964
Fair value measurements on recurring basis \| Level 1 \| US Treasury and agency securities
Fair value of marketable securities
Debt securities	51,870	42,710
Fair value measurements on recurring basis \| Level 1 \| Equity securities
Fair value of marketable securities
Equity securities	187,654	393,254
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash Equivalents (including restricted)	543,308	6,735,774
Subtotal	235,467	1,630,611
Derivative financial instruments	551,847	383,460
Total	787,314	2,014,071
Fair value measurements on recurring basis \| Level 2 \| US Treasury and agency securities
Fair value of marketable securities
Debt securities	4,884	15,544
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities		68,556
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	161,668	1,488,340
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt securities	57,123	58,171
Fair value measurements on recurring basis \| Level 3
Fair value of marketable securities
Subtotal	8,065	142,140
Total	8,065	142,140
Fair value measurements on recurring basis \| Level 3 \| Corporate securities
Fair value of marketable securities
Debt securities		7,704
Fair value measurements on recurring basis \| Level 3 \| Other (including restricted)
Fair value of marketable securities
Debt securities	$ 207	$ 134,436

Marketable debt and equity securities.

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

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