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Marketable Securities - Available-for-sale Securities by Maturities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Summary of maturities, at par, of marketable securities |  |
2014 | $ 9,051 | $ 17,166
2015 | 20,191 | 19,791
2016 | 10,040 | 10,040
2017 | 9,628 | 6,842
Available for Sale Securities Maturities, Year Five, at Par | 2,421 |
Total | 51,331 | 53,839
Certificates of deposit |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 1,166 | 1,627
2015 | 4,213 | 4,213
2016 | 1,501 | 1,501
2017 | 831 | 681
Available for Sale Securities Maturities, Year Five, at Par | 509 |
Total | 8,220 | 8,022
U.S. Treasury and agency notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 4,481 | 5,485
2015 | 3,836 | 3,336
2016 | 600 | 600
2017 | 1,209 | 692
Available for Sale Securities Maturities, Year Five, at Par | 523 |
Total | 10,649 | 10,113
Corporate notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 1,919 | 6,729
2015 | 9,937 | 10,037
2016 | 6,704 | 6,704
2017 | 6,798 | 5,174
Available for Sale Securities Maturities, Year Five, at Par | 1,264 |
Total | 26,622 | 28,644
Municipal notes |  |
Summary of maturities, at par, of marketable securities |  |
2014 | 1,485 | 3,325
2015 | 2,205 | 2,205
2016 | 1,235 | 1,235
2017 | 790 | 295
Available for Sale Securities Maturities, Year Five, at Par | 125 |
Total | $ 5,840 | $ 7,060

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