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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
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, 2015 |  | December 31, 2014
Marketable Securities: | Fair Value Hierarchy |  | Cost |  | Estimated Fair Value |  | Cost |  | Estimated Fair Value
Certificates of deposit |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | $ | 3,925 |  |  | $ | 3,899 |  |  | $ | 2,522 |  |  | $ | 2,492 |
with unrecognized losses for more than 12 months |  |  | 620 |  |  | 619 |  |  | 837 |  |  | 832 |
with unrecognized gains |  |  | 3,789 |  |  | 3,798 |  |  | 5,379 |  |  | 5,395 |
Total Certificates of deposit | Level 1 |  | 8,334 |  |  | 8,316 |  |  | 8,738 |  |  | 8,719 |
US Treasury and agency notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 723 |  |  | 720 |  |  | 1,919 |  |  | 1,910 |
with unrecognized losses for more than 12 months |  |  | 200 |  |  | 200 |  |  | 702 |  |  | 700 |
with unrecognized gains |  |  | 1,764 |  |  | 1,790 |  |  | 1,182 |  |  | 1,207 |
Total US Treasury and agency notes | Level 2 |  | 2,687 |  |  | 2,710 |  |  | 3,803 |  |  | 3,817 |
Corporate notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 8,049 |  |  | 7,996 |  |  | 3,872 |  |  | 3,841 |
with unrecognized losses for more than 12 months |  |  | 2,520 |  |  | 2,507 |  |  | 4,423 |  |  | 4,405 |
with unrecognized gains |  |  | 12,893 |  |  | 12,934 |  |  | 16,897 |  |  | 16,963 |
Total Corporate notes | Level 2 |  | 23,462 |  |  | 23,437 |  |  | 25,192 |  |  | 25,209 |
Municipal notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 1,532 |  |  | 1,518 |  |  | 739 |  |  | 733 |
with unrecognized losses for more than 12 months |  |  | 641 |  |  | 634 |  |  | 457 |  |  | 456 |
with unrecognized gains |  |  | 2,662 |  |  | 2,674 |  |  | 3,183 |  |  | 3,206 |
Total Municipal notes | Level 2 |  | 4,835 |  |  | 4,826 |  |  | 4,379 |  |  | 4,395 |
|  |  | $ | 39,318 |  |  | $ | 39,289 |  |  | $ | 42,112 |  |  | $ | 42,140 |
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, 2015 | 2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | Total
Certificates of deposit | $ | 1,355 |  |  | $ | 2,492 |  |  | $ | 631 |  |  | $ | 3,800 |  |  | $ | — |  |  | $ | 8,278 |
U.S. Treasury and agency notes | 419 |  |  | 100 |  |  | 959 |  |  | 1,079 |  |  | 188 |  |  | 2,745 |
Corporate notes | 3,653 |  |  | 6,604 |  |  | 6,625 |  |  | 5,845 |  |  | — |  |  | 22,727 |
Municipal notes | 1,080 |  |  | 1,325 |  |  | 940 |  |  | 1,355 |  |  | — |  |  | 4,700 |
| $ | 6,507 |  |  | $ | 10,521 |  |  | $ | 9,155 |  |  | $ | 12,079 |  |  | $ | 188 |  |  | $ | 38,450 |
At December 31, 2014 | 2015 |  | 2016 |  | 2017 |  | 2018 |  | Total
Certificates of deposit | $ | 4,213 |  |  | $ | 1,501 |  |  | $ | 831 |  |  | 2,149 |  |  | $ | 8,694 |
U.S. Treasury and agency notes | 1,176 |  |  | 600 |  |  | 1,209 |  |  | 879 |  |  | 3,864 |
Corporate notes | 9,588 |  |  | 6,704 |  |  | 6,498 |  |  | 1,625 |  |  | 24,415 |
Municipal notes | 2,105 |  |  | 1,235 |  |  | 790 |  |  | 125 |  |  | 4,255 |
| $ | 17,082 |  |  | $ | 10,040 |  |  | $ | 9,328 |  |  | $ | 4,778 |  |  | $ | 41,228 |

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