Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Investments Measured at Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair value of marketable securities
Debt securities	$ 93,454	$ 117,295
US Treasury and agency securities
Fair value of marketable securities
Debt securities	72,988	81,982
Corporate securities
Fair value of marketable securities
Debt securities	19,821	33,555
Other (including restricted)
Fair value of marketable securities
Debt securities	645	1,758
Fair value measurements on recurring basis
Fair value of marketable securities
Cash Equivalents (including restricted)	6,705,088	5,187,900
Total	93,454	117,295
Fair value measurements on recurring basis \| US Treasury and agency securities
Fair value of marketable securities
Debt securities	72,988	81,982
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	19,821	33,555
Fair value measurements on recurring basis \| Other (including restricted)
Fair value of marketable securities
Debt securities	645	1,758
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash Equivalents (including restricted)	347,653	147,494
Total	72,988	81,982
Fair value measurements on recurring basis \| Level 1 \| US Treasury and agency securities
Fair value of marketable securities
Debt securities	72,988	81,982
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash Equivalents (including restricted)	6,357,435	5,040,406
Total	7,573	28,592
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	7,117	27,025
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt securities	456	1,567
Fair value measurements on recurring basis \| Level 3
Fair value of marketable securities
Total	12,893	6,721
Fair value measurements on recurring basis \| Level 3 \| Corporate securities
Fair value of marketable securities
Debt securities	12,704	6,530
Fair value measurements on recurring basis \| Level 3 \| Other (including restricted)
Fair value of marketable securities
Debt securities	$ 189	$ 191

Represents the fair value of investments in marketable debt and equity securities. It also represents the fair values of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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