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Cash and Cash Equivalents and Short-term Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
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Cash and cash equivalents and short-term investments |  |  |  |
Cash and cash equivalents | $ 508,128 | $ 524,922 | $ 320,398 | $ 398,575
Short-term investments: |  |  |  |
Trading equity securities |  | 52,705 |  |
Available-for-sale equity securities | 78,662 | 174,610 |  |
Available-for-sale debt securities | 21,170 | 25,967 |  |
Total short-term investments | $ 99,832 | $ 253,282 |  |

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