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Marketable Securities (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Summary of maturities, at par, of marketable securities |  |
2012 | $ 3,958 | $ 10,580
2013 | 23,761 | 25,276
2014 | 22,051 | 20,551
2015 | 15,466 | 10,206
2016 | 1,714 |
Total | 66,950 | 66,613
Certificates of deposit [Member] |  |
Summary of maturities, at par, of marketable securities |  |
2012 | 200 | 1,536
2013 | 1,255 | 1,255
2014 | 1,627 | 1,627
2015 | 2,739 | 2,526
2016 | 301 |
Total | 6,122 | 6,944
U.S. Treasury and agency notes [Member] |  |
Summary of maturities, at par, of marketable securities |  |
2012 | 671 | 4,734
2013 | 8,785 | 10,285
2014 | 8,982 | 5,856
2015 | 2,633 | 936
2016 |  |
Total | 21,071 | 21,811
Corporate notes [Member] |  |
Summary of maturities, at par, of marketable securities |  |
2012 | 2,377 | 3,450
2013 | 11,416 | 11,231
2014 | 7,097 | 8,923
2015 | 8,334 | 5,584
2016 | 1,313 |
Total | 30,537 | 29,188
Municipal notes [Member] |  |
Summary of maturities, at par, of marketable securities |  |
2012 | 710 | 860
2013 | 2,305 | 2,505
2014 | 4,345 | 4,145
2015 | 1,760 | 1,160
2016 | 100 |
Total | $ 9,220 | $ 8,670

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