Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Marketable investment securities, restricted cash and cash equivalents, and other investments
Total marketable investment securities - current	$ 1,124,087	$ 1,139,103
Total	1,135,865us-gaap_AvailableForSaleSecurities	1,150,815us-gaap_AvailableForSaleSecurities
Other investments-noncurrent:
Cost method	31,174us-gaap_CostMethodInvestments	31,174us-gaap_CostMethodInvestments
Equity method	127,039us-gaap_EquityMethodInvestments	128,788us-gaap_EquityMethodInvestments
Total other investments-noncurrent	158,213	159,962
Total marketable investment securities, restricted cash and cash equivalents, and other investments	1,302,291us-gaap_Investments	1,318,010us-gaap_Investments
Restricted cash and marketable investment securities
Marketable investment securities, restricted cash and cash equivalents, and other investments
Restricted marketable investment securities	11,778	11,712
Restricted cash and cash equivalents	8,213	7,233
Corporate Bonds
Marketable investment securities, restricted cash and cash equivalents, and other investments
Total marketable investment securities - current	1,052,390	1,049,139
Strategic equity securities
Marketable investment securities, restricted cash and cash equivalents, and other investments
Total marketable investment securities - current	41,962	41,705
Other
Marketable investment securities, restricted cash and cash equivalents, and other investments
Total marketable investment securities - current	$ 29,735	$ 48,259

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities, which are intended be sold or mature greater than one year from the balance sheet date 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, 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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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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