Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Marketable investment securities, restricted cash and other investment securities
Strategic - available-for-sale	$ 185	$ 193
Strategic - trading/equity (Note 2)	2,894	2,370
Marketable investment securities	816,375	1,181,471
Total marketable investment securities	875,772	1,248,490
Restricted cash and cash equivalents	8,666	578
Total other investment securities	161,653	118,992
Total marketable investment securities, restricted cash and cash equivalents, and other investment securities	1,046,091	1,368,060
Other investment securities
Marketable investment securities, restricted cash and other investment securities
Marketable investment securities	813,296	1,178,908
Other investment securities - equity method	161,653	118,992
Restricted Marketable Investment Securities [Member]
Marketable investment securities, restricted cash and other investment securities
Total marketable investment securities	$ 59,397	$ 67,019

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

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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 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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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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