Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Marketable investment securities, restricted cash and other investment securities
Strategic - available-for-sale	$ 193	$ 195
Strategic - trading/equity (Note 2)	2,370	93,367
Marketable investment securities	1,181,471	501,165
Total marketable investment securities	1,248,490	573,179
Restricted cash and cash equivalents	578	393
Total other investment securities	118,992	113,460
Total marketable investment securities, restricted cash and cash equivalents, and other investment securities	1,368,060	687,032
Other investment securities
Marketable investment securities, restricted cash and other investment securities
Marketable investment securities	1,178,908	407,603
Other investment securities	118,992	113,460
Restricted Marketable Investment Securities [Member]
Marketable investment securities, restricted cash and other investment securities
Total marketable investment securities	$ 67,019	$ 72,014

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 and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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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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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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