Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair value of marketable securities
Debt securities	$ 4,720	$ 141,335
Total marketable investment securities	86,819	223,615
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	82,290	82,124
Corporate securities
Fair value of marketable securities
Debt securities	4,529	90,838
Other (including restricted)
Fair value of marketable securities
Debt securities		17,382
Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	139,869	307,406
Total marketable investment securities	86,819	223,615
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	82,290	82,124
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	4,529	90,838
Fair value measurements on recurring basis \| Other (including restricted)
Fair value of marketable securities
Debt securities		17,382
Fair value measurements on recurring basis \| Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	115,036	25,814
Total marketable investment securities	77,560	110,599
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	77,560	77,328
Fair value measurements on recurring basis \| Level 1 \| Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	24,833	281,592
Total marketable investment securities	9,259	113,016
Fair value measurements on recurring basis \| Level 2 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	4,730	4,796
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	$ 4,529	90,838
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt securities		$ 17,382

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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-Publisher FASB
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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