Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair value of marketable securities
Debt securities	$ 303,503	$ 214,389
Equity Securities	5	2,370
Total marketable investment securities	303,508	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	119,304	66,823
Commercial paper
Fair value of marketable securities
Debt securities	128,966	45,938
Corporate securities
Fair value of marketable securities
Debt securities	53,226	100,662
Other
Fair value of marketable securities
Debt securities	2,007	966
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	557,923	114,464
Equity Securities	5	2,370
Total marketable investment securities	303,508	216,759
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	119,304	66,823
Fair value measurements on recurring basis \| Commercial paper
Fair value of marketable securities
Debt securities	128,966	45,938
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	53,226	100,662
Fair value measurements on recurring basis \| Other
Fair value of marketable securities
Debt securities	2,007	966
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	46,720	12,493
Equity Securities	5	2,370
Total marketable investment securities	119,309	69,193
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	119,304	66,823
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	511,203	101,971
Total marketable investment securities	184,199	147,566
Fair value measurements on recurring basis \| Level 2 \| Commercial paper
Fair value of marketable securities
Debt securities	128,966	45,938
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	53,226	100,662
Fair value measurements on recurring basis \| Level 2 \| Other
Fair value of marketable securities
Debt securities	$ 2,007	$ 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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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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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Amount of investment in marketable security.

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-Publisher FASB
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-Topic 942
-SubTopic 210
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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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