Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Marketable investment securities, restricted cash and other investment securities
Strategic - available-for-sale	$ 387,000
Total current marketable investment securities	362,953	$ 416,704
Total marketable investment securities	387,420	417,094
Restricted cash and cash equivalents	83,902	60,677
Total other investment securities	149,706	160,074
Total marketable investment securities, restricted cash and cash equivalents, and other investment securities	621,028	637,845
Current marketable investment securities - strategic - available-for-sale
Marketable investment securities, restricted cash and other investment securities
Total current marketable investment securities	195	196
Other investment securities
Marketable investment securities, restricted cash and other investment securities
Total current marketable investment securities	362,758	416,508
Other investment securities	149,706	160,074
Restricted Marketable Investment Securities [Member]
Marketable investment securities, restricted cash and other investment securities
Total marketable investment securities	$ 24,467	$ 390

Marketable investment securities, restricted cash and cash equivalent and other investment securities.

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Fair value and equity method investments.

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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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Amount of investment in marketable security.

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Amount of investment in marketable security, classified as current.

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Amount of investments classified as other.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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