Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Marketable investment securities, restricted cash and other investment securities
Strategic - trading	$ 93,367
Total current marketable investment securities	501,165	$ 35,616
Restricted marketable investment securities	72,014	81,679
Total marketable investment securities	573,179	117,295
Restricted cash and cash equivalents	393	681
Total other investment securities	113,460	33,248
Total marketable investment securities, restricted cash and cash equivalents and other investment securities	687,032	151,224
Pre-tax unrealized gain of trading securities	85,217
Current marketable investment securities - strategic
Marketable investment securities, restricted cash and other investment securities
Strategic - available-for-sale	195	6,721
Current marketable investment securities - strategic - trading
Marketable investment securities, restricted cash and other investment securities
Fair value of trading investment	93,000
Current marketable investment securities - strategic - trading \| Other Income (Expense)
Marketable investment securities, restricted cash and other investment securities
Pre-tax unrealized gain of trading securities	85,000
Current marketable investment securities - other
Marketable investment securities, restricted cash and other investment securities
Other	407,603	28,895
Other investment securities
Marketable investment securities, restricted cash and other investment securities
Other investment securities - equity method	$ 113,460	25,098
Other investment securities - cost method		$ 8,150

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, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for greater than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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Amount of investments classified as other.

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Amount of other investments not classified as trading, available-for-sale or held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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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 investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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