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Cash, Cash Equivalents and Investments (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011
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Effective maturity dates of available-for-sale investments |
Less than 1 Year | $ 144,431
1-2 Years | 82,500
2-3 Years | 56,087
3-4 Years | 2,398
4-5 Years | 27,988
Fair Value, Total | 313,404
Treasury bills [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 1,945
1-2 Years | 0
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 1,945
Municipal bonds [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 54,036
1-2 Years | 25,713
2-3 Years | 23,976
3-4 Years | 0
4-5 Years | 19,991
Fair Value, Total | 123,716
Corporate bonds [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 55,570
1-2 Years | 33,555
2-3 Years | 21,543
3-4 Years | 2,398
4-5 Years | 2,406
Fair Value, Total | 115,472
Agency bonds [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 27,545
1-2 Years | 7,700
2-3 Years | 4,635
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 39,880
Sovereign bonds [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 4,016
1-2 Years | 10,831
2-3 Years | 5,933
3-4 Years | 0
4-5 Years | 5,591
Fair Value, Total | 26,371
Covered bonds [Member] |
Effective maturity dates of available-for-sale investments |
Less than 1 Year | 1,319
1-2 Years | 4,701
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | $ 6,020

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