Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Feb. 28, 2017
Marketable Investment Securities, Restricted Cash and Cash Equivalents and Other Investment Securities:
Trading/equity (Note 2)	$ 71,943	$ 71,943	$ 93,367
Other			92,146
Total current marketable investment securities	71,943	71,943	185,513
Restricted marketable investment securities(1)	72,554	72,554	72,014
Total marketable investment securities	144,497	144,497	257,527
Restricted cash and cash equivalents (1)	418	418	393
Other investment securities - equity method	115,870	115,870	113,460
Total other investment securities	115,870	115,870	113,460
Total marketable investment securities, restricted cash and cash equivalents, and other investment securities	260,785	260,785	$ 371,380
Marketable investment securities - unrealized gains (losses) on trading securities	16,441	$ (20,848)
Maximum maturities of commercial paper		365 days
Maximum maturities of corporate securities		18 months
Marketable investment securities - unrealized gains (losses) on trading securities	$ 16,441	$ (20,848)
NagraStar L.L.C
Marketable Investment Securities, Restricted Cash and Cash Equivalents and Other Investment Securities:
Ownership interest in equity method investment				50.00%

Maximum maturities of commercial paper.

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Maximum maturities of corporate securities.

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

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The amount of marketable securities pledged as collateral noncurrent.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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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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