Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accumulated net unrealized gains (losses)
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)	$ 43,196,000	$ 15,378,000
Accumulated net unrealized gains, net of tax, in accumulated other comprehensive income (loss)	28,000,000	11,000,000
Components of available-for-sale investments
Debt securities	1,401,145,000	4,117,326,000
Total marketable investment securities	1,478,115,000us-gaap_MarketableSecurities	4,181,228,000us-gaap_MarketableSecurities
Unrealized Gains (Losses) on Marketable Investment Securities
Unrealized Gains	43,352,000	18,733,000
Unrealized Losses	(156,000)	(3,355,000)
Unrealized Gains Losses, Net	43,196,000	15,378,000
Contractual maturities of restricted and non-restricted marketable investment securities
Debt securities with contractual maturities within one year	1,132,000,000
Debt securities with contractual maturities extending longer than one year through and including five years	272,000,000
Debt securities with contractual maturities longer than ten years	23,000,000
U.S. Treasury and agency securities
Accumulated net unrealized gains (losses)
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)	(4,000)
Components of available-for-sale investments
Debt securities	58,254,000
Unrealized Gains (Losses) on Marketable Investment Securities
Unrealized Gains	7,000
Unrealized Losses	(11,000)
Unrealized Gains Losses, Net	(4,000)
Commercial paper
Components of available-for-sale investments
Debt securities	65,696,000	381,515,000
Corporate securities
Accumulated net unrealized gains (losses)
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)	5,463,000	2,287,000
Components of available-for-sale investments
Debt securities	1,247,403,000	3,520,092,000
Unrealized Gains (Losses) on Marketable Investment Securities
Unrealized Gains	5,608,000	5,436,000
Unrealized Losses	(145,000)	(3,149,000)
Unrealized Gains Losses, Net	5,463,000	2,287,000
Other (including restricted)
Accumulated net unrealized gains (losses)
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)		(195,000)
Components of available-for-sale investments
Debt security	55,788,000	253,098,000
Unrealized Gains (Losses) on Marketable Investment Securities
Unrealized Gains		11,000
Unrealized Losses		(206,000)
Unrealized Gains Losses, Net		(195,000)
Equity Securities
Accumulated net unrealized gains (losses)
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)	37,737,000	13,286,000
Components of available-for-sale investments
Equity securities	50,974,000	26,523,000
Unrealized Gains (Losses) on Marketable Investment Securities
Unrealized Gains	37,737,000	13,286,000
Unrealized Gains Losses, Net	$ 37,737,000	$ 13,286,000

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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