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Investment Securities (Details) (USD $)
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3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2013
Restricted cash and marketable investment securities
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Dec. 31, 2012
Restricted cash and marketable investment securities
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Dec. 31, 2013
Corporate Bonds
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Dec. 31, 2012
Corporate Bonds
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Dec. 31, 2013
VRDNs
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Dec. 31, 2012
VRDNs
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Dec. 31, 2012
Strategic equity securities
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Dec. 31, 2013
Strategic equity securities
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Dec. 31, 2013
Other
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Dec. 31, 2012
Other
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| Marketable investment securities, restricted cash and cash equivalents, and other investments | ||||||||||||
| Total marketable investment securities - current | $ 815,951,000 | $ 986,533,000 | $ 833,791,000 | $ 654,096,000 | $ 34,705,000 | $ 66,145,000 | $ 56,288,000 | $ 33,613,000 | $ 84,424,000 | $ 39,422,000 | ||
| Restricted marketable investment securities | 7,965,000 | 7,529,000 | ||||||||||
| Total | 823,480,000 | 994,498,000 | ||||||||||
| Restricted cash and cash equivalents | 8,172,000 | 21,516,000 | ||||||||||
| Dividend income from one of the entity's strategic investments | 28,500,000 | 46,000,000 | ||||||||||
| Other investments-noncurrent: | ||||||||||||
| Cost method | 27,711,000 | 25,977,000 | ||||||||||
| Equity method | 155,500,000 | 143,794,000 | ||||||||||
| Total other investments-noncurrent | 183,211,000 | 169,771,000 | ||||||||||
| Total marketable investment securities, restricted cash and cash equivalents, and other investments | $ 1,028,207,000 | $ 1,172,441,000 | ||||||||||