Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value of marketable securities
Debt securities	$ 214,389	$ 164,160
Equity Securities	2,370	93,367
Total marketable investment securities	216,759	257,527
Transfer of investments from Level 1 to Level 2	0	0
Transfer of investments from Level 2 to Level 1	0	0
U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	66,823	74,788
Commercial paper
Fair value of marketable securities
Debt securities	45,938	24,407
Corporate securities
Fair value of marketable securities
Debt securities	100,662	63,809
Other (including restricted)
Fair value of marketable securities
Debt securities	966	1,156
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	114,464	315,030
Equity Securities	2,370	93,367
Total marketable investment securities	216,759	257,527
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	66,823	74,788
Fair value measurements on recurring basis \| Commercial paper
Fair value of marketable securities
Debt securities	45,938	24,407
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	100,662	63,809
Fair value measurements on recurring basis \| Other (including restricted)
Fair value of marketable securities
Debt securities	966	1,156
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	12,493	140
Equity Securities	2,370	93,367
Total marketable investment securities	69,193	168,155
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	66,823	74,788
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	101,971	314,890
Total marketable investment securities	147,566	89,372
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	45,938	24,407
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	100,662	63,809
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt securities	$ 966	$ 1,156

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of investment in marketable security.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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