Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair value of marketable securities
Debt securities	$ 242,566	$ 214,389
Equity Securities	2,894	2,370
Total marketable investment securities	245,460	216,759
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	59,155	66,823
Commercial paper
Fair value of marketable securities
Debt securities	86,353	45,938
Corporate securities
Fair value of marketable securities
Debt securities	95,542	100,662
Other
Fair value of marketable securities
Debt securities	1,516	966
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	343,783	114,464
Equity Securities	2,894	2,370
Total marketable investment securities	245,460	216,759
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	59,155	66,823
Fair value measurements on recurring basis \| Commercial paper
Fair value of marketable securities
Debt securities	86,353	45,938
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	95,542	100,662
Fair value measurements on recurring basis \| Other
Fair value of marketable securities
Debt securities	1,516	966
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	58,435	12,493
Equity Securities	2,894	2,370
Total marketable investment securities	62,049	69,193
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	59,155	66,823
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	285,348	101,971
Total marketable investment securities	183,411	147,566
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	86,353	45,938
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	95,542	100,662
Fair value measurements on recurring basis \| Level 2 \| Other
Fair value of marketable securities
Debt securities	$ 1,516	$ 966

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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