Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Marketable investment securities, restricted cash and other investment securities
Strategic - available-for-sale	$ 147,000
Total current marketable investment securities	135,485	$ 362,953
Total marketable investment securities	146,832	387,420
Restricted cash and cash equivalents	96,957	83,902
Other investment securities	152,719	149,706
Total marketable investment securities, restricted cash and cash equivalents, and other investment securities	396,508	621,028
Current marketable investment securities - strategic - available-for-sale
Marketable investment securities, restricted cash and other investment securities
Total current marketable investment securities	194	195
Other investment securities
Marketable investment securities, restricted cash and other investment securities
Total current marketable investment securities	135,291	362,758
Other investment securities	152,719	149,706
Restricted Marketable Investment Securities [Member]
Marketable investment securities, restricted cash and other investment securities
Total marketable investment securities	$ 11,347	$ 24,467

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 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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