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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 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) |  |  | June 30, 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 |  |  | $ | 1,290 |  |  | $ | 1,282 |  |  | $ | 1,690 |  |  | $ | 1,677 |
with unrecognized losses for more than 12 months |  |  | 459 |  |  | 455 |  |  | 110 |  |  | 110 |
with unrecognized gains |  |  | 6,530 |  |  | 6,560 |  |  | 6,298 |  |  | 6,334 |
Total Certificates of deposit | Level 1 |  | 8,279 |  |  | 8,297 |  |  | 8,098 |  |  | 8,121 |
US Treasury and agency notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 3,434 |  |  | 3,427 |  |  | 4,672 |  |  | 4,664 |
with unrecognized losses for more than 12 months |  |  | 1,322 |  |  | 1,319 |  |  | 1,699 |  |  | 1,694 |
with unrecognized gains |  |  | 5,851 |  |  | 5,889 |  |  | 3,713 |  |  | 3,760 |
Total US Treasury and agency notes | Level 2 |  | 10,607 |  |  | 10,635 |  |  | 10,084 |  |  | 10,118 |
Corporate notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 3,010 |  |  | 2,990 |  |  | 7,270 |  |  | 7,192 |
with unrecognized losses for more than 12 months |  |  | 1,338 |  |  | 1,334 |  |  | 530 |  |  | 523 |
with unrecognized gains |  |  | 23,338 |  |  | 23,524 |  |  | 21,945 |  |  | 22,173 |
Total Corporate notes | Level 2 |  | 27,686 |  |  | 27,848 |  |  | 29,745 |  |  | 29,888 |
Municipal notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 419 |  |  | 417 |  |  | 1,688 |  |  | 1,677 |
with unrecognized losses for more than 12 months |  |  | 315 |  |  | 311 |  |  | 318 |  |  | 316 |
with unrecognized gains |  |  | 5,291 |  |  | 5,336 |  |  | 5,267 |  |  | 5,316 |
Total Municipal notes | Level 2 |  | 6,025 |  |  | 6,064 |  |  | 7,273 |  |  | 7,309 |
|  |  | $ | 52,597 |  |  | $ | 52,844 |  |  | $ | 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 June 30, 2014 | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | Total
Certificates of deposit | $ | 1,166 |  |  | $ | 4,213 |  |  | $ | 1,501 |  |  | $ | 831 |  |  | $ | 509 |  |  | $ | 8,220 |
U.S. Treasury and agency notes | 4,481 |  |  | 3,836 |  |  | 600 |  |  | 1,209 |  |  | 523 |  |  | $ | 10,649 |
Corporate notes | 1,919 |  |  | 9,937 |  |  | 6,704 |  |  | 6,798 |  |  | 1,264 |  |  | $ | 26,622 |
Municipal notes | 1,485 |  |  | 2,205 |  |  | 1,235 |  |  | 790 |  |  | 125 |  |  | $ | 5,840 |
| $ | 9,051 |  |  | $ | 20,191 |  |  | $ | 10,040 |  |  | $ | 9,628 |  |  | $ | 2,421 |  |  | $ | 51,331 |
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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