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Investment Securities (Details 4) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Realized gains (losses) on marketable investment securities | |||
| Realized gains from the sales of available-for-sale marketable investment securities | $ 36,300,000 | $ 175,200,000 | $ 6,700,000 |
| Proceeds from sales of available-for-sale marketable investment securities | 177,500,000 | 601,300,000 | 1,540,000,000 |
| Fair value of marketable investment securities in a loss position | |||
| Less than 12 months | 571,592,000 | 275,587,000 | |
| 12 months or more | 12,963,000 | ||
| Total | 571,592,000 | 288,550,000 | |
| Unrealized losses on marketable investment securities in a loss position | |||
| Less than 12 months | (825,000) | (288,000) | |
| 12 or more | (19,000) | ||
| Total | $ (825,000) | $ (307,000) | |
| X | ||||||||||
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- Definition
Amount of accumulated unrealized loss on securities classified as available-for-sale securities that have been in a loss position for twelve months or longer. No definition available.
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- Definition
Amount of accumulated unrealized loss on securities classified as available-for-sale securities, impacting investments. No definition available.
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- Definition
Amount of accumulated unrealized loss on securities classified as available-for-sale securities that have been in a loss position for less than twelve months impacting investments. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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