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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2012
Marketable Securities [Abstract] |
Summary of available-for-sale securities | The following is a summary of available-for-sale securities at June 30, 2012 and December 31, 2011:
($ in thousands) |  |  |  |  | 2012 |  |  | 2011 |
Marketable Securities: |  | Fair Value Hierarchy |  |  | Cost |  |  | Estimated Fair Value |  |  | Cost |  |  | Estimated Fair Value |
Certificates of deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  |  |  |  | $ | 1,902 |  |  | $ | 1,893 |  |  | $ | 3,646 |  |  | $ | 3,605 |
with unrecognized losses for more than 12 months |  |  |  |  |  |  | 103 |  |  |  | 103 |  |  |  | — |  |  |  | — |
with unrecognized gains |  |  |  |  |  |  | 4,324 |  |  |  | 4,360 |  |  |  | 3,525 |  |  |  | 3,551 |
Total Certificates of deposit |  |  | Level 1 |  |  |  | 6,329 |  |  |  | 6,356 |  |  |  | 7,171 |  |  |  | 7,156 |
US Treasury and agency notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  |  |  |  |  | 6,293 |  |  |  | 6,236 |  |  |  | 4,352 |  |  |  | 4,338 |
with unrecognized losses for more than 12 months |  |  |  |  |  |  | — |  |  |  | — |  |  |  | 1,002 |  |  |  | 1,000 |
with unrecognized gains |  |  |  |  |  |  | 14,723 |  |  |  | 14,844 |  |  |  | 16,479 |  |  |  | 16,660 |
Total US Treasury and agency notes |  |  | Level 2 |  |  |  | 21,016 |  |  |  | 21,080 |  |  |  | 21,833 |  |  |  | 21,998 |
Corporate notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  |  |  |  |  | 4,739 |  |  |  | 4,707 |  |  |  | 9,230 |  |  |  | 9,098 |
with unrecognized losses for more than 12 months |  |  |  |  |  |  | 821 |  |  |  | 818 |  |  |  | 1,539 |  |  |  | 1,494 |
with unrecognized gains |  |  |  |  |  |  | 26,052 |  |  |  | 26,460 |  |  |  | 19,369 |  |  |  | 19,738 |
Total Corporate notes |  |  | Level 2 |  |  |  | 31,612 |  |  |  | 31,985 |  |  |  | 30,138 |  |  |  | 30,330 |
Municipal notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  |  |  |  |  | 1,058 |  |  |  | 1,048 |  |  |  | 1,177 |  |  |  | 1,165 |
with unrecognized losses for more than 12 months |  |  |  |  |  |  | 952 |  |  |  | 944 |  |  |  | 881 |  |  |  | 873 |
with unrecognized gains |  |  |  |  |  |  | 7,516 |  |  |  | 7,622 |  |  |  | 6,964 |  |  |  | 7,044 |
Total Municipal notes |  |  | Level 2 |  |  |  | 9,526 |  |  |  | 9,614 |  |  |  | 9,022 |  |  |  | 9,082 |
|  |  |  |  |  | $ | 68,483 |  |  | $ | 69,035 |  |  | $ | 68,164 |  |  | $ | 68,566 |
Summary of maturities, at par, of marketable securities | The following tables summarize the maturities, at par, of marketable securities by year:
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At June 30, 2012 |  | 2012 |  |  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | Total |
Certificates of deposit |  | $ | 200 |  |  | $ | 1,255 |  |  | $ | 1,627 |  |  | $ | 2,739 |  |  | $ | 301 |  |  | $ | 6,122 |
U.S. Treasury and agency notes |  |  | 671 |  |  |  | 8,785 |  |  |  | 8,982 |  |  |  | 2,633 |  |  |  | — |  |  |  | 21,071 |
Corporate notes |  |  | 2,377 |  |  |  | 11,416 |  |  |  | 7,097 |  |  |  | 8,334 |  |  |  | 1,313 |  |  |  | 30,537 |
Municipal notes |  |  | 710 |  |  |  | 2,305 |  |  |  | 4,345 |  |  |  | 1,760 |  |  |  | 100 |  |  |  | 9,220 |
|  | $ | 3,958 |  |  | $ | 23,761 |  |  | $ | 22,051 |  |  | $ | 15,466 |  |  | $ | 1,714 |  |  | $ | 66,950 |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2011 |  | 2012 |  |  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | Total |
Certificates of deposit |  | $ | 1,536 |  |  | $ | 1,255 |  |  | $ | 1,627 |  |  | $ | 2,526 |  |  | $ | — |  |  | $ | 6,944 |
U.S. Treasury and agency notes |  |  | 4,734 |  |  |  | 10,285 |  |  |  | 5,856 |  |  |  | 936 |  |  |  | — |  |  |  | 21,811 |
Corporate notes |  |  | 3,450 |  |  |  | 11,231 |  |  |  | 8,923 |  |  |  | 5,584 |  |  |  | — |  |  |  | 29,188 |
Municipal notes |  |  | 860 |  |  |  | 2,505 |  |  |  | 4,145 |  |  |  | 1,160 |  |  |  | — |  |  |  | 8,670 |
|  | $ | 10,580 |  |  | $ | 25,276 |  |  | $ | 20,551 |  |  | $ | 10,206 |  |  | $ | — |  |  | $ | 66,613 |

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