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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Summary of available-for-sale securities | The following is a summary of available-for-sale securities at:
($ in thousands) |  |  | March 31, 2014 |  | December 31, 2013
Marketable Securities: | Fair Value Hierarchy |  | Cost |  | Estimated Fair Value |  | Cost |  | Estimated Fair Value
Certificates of deposit |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | $ | 1,362 |  |  | $ | 1,345 |  |  | $ | 1,690 |  |  | $ | 1,677 |
with unrecognized losses for more than 12 months |  |  | 359 |  |  | 355 |  |  | 110 |  |  | 110 |
with unrecognized gains |  |  | 6,645 |  |  | 6,681 |  |  | 6,298 |  |  | 6,334 |
Total Certificates of deposit | Level 1 |  | 8,366 |  |  | 8,381 |  |  | 8,098 |  |  | 8,121 |
US Treasury and agency notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 3,289 |  |  | 3,281 |  |  | 4,672 |  |  | 4,664 |
with unrecognized losses for more than 12 months |  |  | 1,702 |  |  | 1,699 |  |  | 1,699 |  |  | 1,694 |
with unrecognized gains |  |  | 4,581 |  |  | 4,621 |  |  | 3,713 |  |  | 3,760 |
Total US Treasury and agency notes | Level 2 |  | 9,572 |  |  | 9,601 |  |  | 10,084 |  |  | 10,118 |
Corporate notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 4,105 |  |  | 4,076 |  |  | 7,270 |  |  | 7,192 |
with unrecognized losses for more than 12 months |  |  | 1,796 |  |  | 1,787 |  |  | 530 |  |  | 523 |
with unrecognized gains |  |  | 21,926 |  |  | 22,123 |  |  | 21,945 |  |  | 22,173 |
Total Corporate notes | Level 2 |  | 27,827 |  |  | 27,986 |  |  | 29,745 |  |  | 29,888 |
Municipal notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 524 |  |  | 520 |  |  | 1,688 |  |  | 1,677 |
with unrecognized losses for more than 12 months |  |  | 249 |  |  | 247 |  |  | 318 |  |  | 316 |
with unrecognized gains |  |  | 6,133 |  |  | 6,184 |  |  | 5,267 |  |  | 5,316 |
Total Municipal notes | Level 2 |  | 6,906 |  |  | 6,951 |  |  | 7,273 |  |  | 7,309 |
|  |  | $ | 52,671 |  |  | $ | 52,919 |  |  | $ | 55,200 |  |  | $ | 55,436 |
Summary of maturities, at par, of marketable securities by year | The following tables summarize the maturities, at par, of marketable securities by year ($ in thousands):
At March 31, 2014 | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | Total
Certificates of deposit | $ | 1,437 |  |  | $ | 4,213 |  |  | $ | 1,501 |  |  | $ | 731 |  |  | $ | 409 |  |  | $ | 8,291 |
U.S. Treasury and agency notes | 4,575 |  |  | 3,336 |  |  | 600 |  |  | 1,092 |  |  | — |  |  | $ | 9,603 |
Corporate notes | 3,769 |  |  | 9,937 |  |  | 6,704 |  |  | 6,098 |  |  | 247 |  |  | $ | 26,755 |
Municipal notes | 2,785 |  |  | 2,205 |  |  | 1,235 |  |  | 495 |  |  | — |  |  | $ | 6,720 |
| $ | 12,566 |  |  | $ | 19,691 |  |  | $ | 10,040 |  |  | $ | 8,416 |  |  | $ | 656 |  |  | $ | 51,369 |
At December 31, 2013 | 2014 |  | 2015 |  | 2016 |  | 2017 |  | Total
Certificates of deposit | $ | 1,627 |  |  | $ | 4,213 |  |  | $ | 1,501 |  |  | $ | 681 |  |  | $ | 8,022 |
U.S. Treasury and agency notes | 5,485 |  |  | 3,336 |  |  | 600 |  |  | 692 |  |  | $ | 10,113 |
Corporate notes | 6,729 |  |  | 10,037 |  |  | 6,704 |  |  | 5,174 |  |  | $ | 28,644 |
Municipal notes | 3,325 |  |  | 2,205 |  |  | 1,235 |  |  | 295 |  |  | $ | 7,060 |
| $ | 17,166 |  |  | $ | 19,791 |  |  | $ | 10,040 |  |  | $ | 6,842 |  |  | $ | 53,839 |

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