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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
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, 2016 |  | December 31, 2015
Marketable Securities: | Fair Value Hierarchy |  | Cost |  | Estimated Fair Value |  | Cost |  | Estimated Fair Value
Certificates of deposit |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | $ | 465 |  |  | $ | 464 |  |  | $ | 4,810 |  |  | $ | 4,797 |
with unrecognized losses for more than 12 months |  |  | — |  |  | — |  |  | 239 |  |  | 238 |
with unrecognized gains |  |  | 6,481 |  |  | 6,510 |  |  | 2,800 |  |  | 2,805 |
Total Certificates of deposit | Level 1 |  | 6,946 |  |  | 6,974 |  |  | 7,849 |  |  | 7,840 |
US Treasury and agency notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | — |  |  | — |  |  | 860 |  |  | 857 |
with unrecognized losses for more than 12 months |  |  | — |  |  | — |  |  | — |  |  | — |
with unrecognized gains |  |  | 2,028 |  |  | 2,037 |  |  | 736 |  |  | 738 |
Total US Treasury and agency notes | Level 2 |  | 2,028 |  |  | 2,037 |  |  | 1,596 |  |  | 1,595 |
Corporate notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 5,084 |  |  | 5,056 |  |  | 14,638 |  |  | 14,516 |
with unrecognized losses for more than 12 months |  |  | 3,160 |  |  | 3,139 |  |  | 2,080 |  |  | 2,061 |
with unrecognized gains |  |  | 11,949 |  |  | 11,981 |  |  | 3,334 |  |  | 3,339 |
Total Corporate notes | Level 2 |  | 20,193 |  |  | 20,176 |  |  | 20,052 |  |  | 19,916 |
Municipal notes |  |  |  |  |  |  |  |  |
with unrecognized losses for less than 12 months |  |  | 666 |  |  | 661 |  |  | 1,742 |  |  | 1,725 |
with unrecognized losses for more than 12 months |  |  | 330 |  |  | 329 |  |  | 301 |  |  | 298 |
with unrecognized gains |  |  | 2,528 |  |  | 2,542 |  |  | 1,435 |  |  | 1,441 |
Total Municipal notes | Level 2 |  | 3,524 |  |  | 3,532 |  |  | 3,478 |  |  | 3,464 |
|  |  | $ | 32,691 |  |  | $ | 32,719 |  |  | $ | 32,975 |  |  | $ | 32,815 |
Summary of maturities, at par, of marketable securities by year | The following tables summarize the maturities, at par, of marketable securities as of:
| March 31, 2016
($ in thousands) | 2016 |  | 2017 |  | 2018 |  | 2019 |  | Total
Certificates of deposit | $ | 1,594 |  |  | $ | 631 |  |  | $ | 4,510 |  |  | $ | 169 |  |  | $ | 6,904 |
U.S. Treasury and agency notes | 100 |  |  | 1,234 |  |  | 579 |  |  | 143 |  |  | 2,056 |
Corporate notes | 4,159 |  |  | 6,525 |  |  | 6,669 |  |  | 2,301 |  |  | 19,654 |
Municipal notes | 975 |  |  | 940 |  |  | 1,455 |  |  | 75 |  |  | 3,445 |
| $ | 6,828 |  |  | $ | 9,330 |  |  | $ | 13,213 |  |  | $ | 2,688 |  |  | $ | 32,059 |
| December 31, 2015
($ in thousands) | 2016 |  | 2017 |  | 2018 |  | 2019 |  | Total
Certificates of deposit | $ | 2,492 |  |  | $ | 631 |  |  | $ | 4,510 |  |  | 169 |  |  | $ | 7,802 |
U.S. Treasury and agency notes | 100 |  |  | 759 |  |  | 579 |  |  | 188 |  |  | 1,626 |
Corporate notes | 4,572 |  |  | 6,525 |  |  | 6,462 |  |  | 1,881 |  |  | 19,440 |
Municipal notes | 995 |  |  | 940 |  |  | 1,455 |  |  | — |  |  | 3,390 |
| $ | 8,159 |  |  | $ | 8,855 |  |  | $ | 13,006 |  |  | $ | 2,238 |  |  | $ | 32,258 |

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