Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair value of marketable securities
Debt securities	$ 185,513	$ 3,833
Debt security	164,160	85,512
Equity Securities	93,367
Total marketable investment securities	257,527	85,512
Transfer of investments from Level 1 to Level 2	0	0
Transfer of investments from Level 2 to Level 1	0
U.S. Treasury and agency securities
Fair value of marketable securities
Debt security	74,788	81,982
Commercial paper
Fair value of marketable securities
Debt security	24,407
Corporate securities
Fair value of marketable securities
Debt security	63,809	3,530
Other (including restricted)
Fair value of marketable securities
Debt security	1,156
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	315,030	702,331
Equity Securities	93,367
Total marketable investment securities	257,527	85,512
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt security	74,788	81,982
Fair value measurements on recurring basis \| Commercial paper
Fair value of marketable securities
Debt security	24,407
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt security	63,809	3,530
Fair value measurements on recurring basis \| Other (including restricted)
Fair value of marketable securities
Debt security	1,156
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	140	4,126
Equity Securities	93,367
Total marketable investment securities	168,155	81,982
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt security	74,788	81,982
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	314,890	698,205
Total marketable investment securities	89,372	3,530
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt security	24,407
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt security	63,809	$ 3,530
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security	$ 1,156

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

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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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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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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