Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value of marketable securities
Debt and equity security	$ 4,340,761	$ 3,789,175
Debt security	4,164,228	3,631,637
Debt security	112,474	106,172
VRDN
Fair value of marketable securities
Debt security	123,976	130,306
ARS and other
Fair value of marketable securities
Debt security	112,000
Other (including restricted)
Fair value of marketable securities
Debt security	3,748,615	3,287,317
Equity securities
Fair value of marketable securities
Equity security	355,696	265,380
Fair value measurements on recurring basis \| Total
Fair value of marketable securities
Cash Equivalents (including restricted)	2,533,492	3,386,929
Total marketable investment securities	4,340,761	3,789,175
Purchases and prepaid funding of derivative financial instruments	558,358
Total	4,899,119	3,789,175
Fair value measurements on recurring basis \| Total \| VRDN
Fair value of marketable securities
Debt security	123,976	130,306
Fair value measurements on recurring basis \| Total \| ARS and other
Fair value of marketable securities
Debt security	112,474	106,172
Fair value measurements on recurring basis \| Total \| Other (including restricted)
Fair value of marketable securities
Debt security	3,748,615	3,287,317
Fair value measurements on recurring basis \| Total \| Equity securities
Fair value of marketable securities
Equity security	355,696	265,380
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash Equivalents (including restricted)	4,336	67,833
Total marketable investment securities	366,811	276,562
Purchases and prepaid funding of derivative financial instruments	209,034
Total	575,845	276,562
Fair value measurements on recurring basis \| Level 1 \| Other (including restricted)
Fair value of marketable securities
Debt security	11,115	11,182
Fair value measurements on recurring basis \| Level 1 \| Equity securities
Fair value of marketable securities
Equity security	355,696	265,380
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash Equivalents (including restricted)	2,529,156	3,319,096
Total marketable investment securities	3,862,347	3,407,396
Purchases and prepaid funding of derivative financial instruments	349,324
Total	4,211,671	3,407,396
Fair value measurements on recurring basis \| Level 2 \| VRDN
Fair value of marketable securities
Debt security	123,976	130,306
Fair value measurements on recurring basis \| Level 2 \| ARS and other
Fair value of marketable securities
Debt security	871	955
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security	3,737,500	3,276,135
Fair value measurements on recurring basis \| Level 3
Fair value of marketable securities
Total marketable investment securities	111,603	105,217
Total	111,603	105,217
Fair value measurements on recurring basis \| Level 3 \| ARS and other
Fair value of marketable securities
Debt security	$ 111,603	$ 105,217

Marketable debt and equity securities.

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