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Marketable Securities - Available-for-sale Securities by Maturities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Summary of maturities, at par, of marketable securities |  |
2014 | $ 12,566 | $ 17,166
2015 | 19,691 | 19,791
2016 | 10,040 | 10,040
2017 | 8,416 | 6,842
Available for Sale Securities Maturities, Year Five, at Par | 656 |
Total | 51,369 | 53,839
Certificates of deposit |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 1,437 | 1,627
2015 | 4,213 | 4,213
2016 | 1,501 | 1,501
2017 | 731 | 681
Available for Sale Securities Maturities, Year Five, at Par | 409 |
Total | 8,291 | 8,022
U.S. Treasury and agency notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 4,575 | 5,485
2015 | 3,336 | 3,336
2016 | 600 | 600
2017 | 1,092 | 692
Available for Sale Securities Maturities, Year Five, at Par | 0 |
Total | 9,603 | 10,113
Corporate notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 3,769 | 6,729
2015 | 9,937 | 10,037
2016 | 6,704 | 6,704
2017 | 6,098 | 5,174
Available for Sale Securities Maturities, Year Five, at Par | 247 |
Total | 26,755 | 28,644
Municipal notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 2,785 | 3,325
2015 | 2,205 | 2,205
2016 | 1,235 | 1,235
2017 | 495 | 295
Available for Sale Securities Maturities, Year Five, at Par | 0 |
Total | $ 6,720 | $ 7,060

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