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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Summary of Marketable Securities Consist of Investments | Marketable securities consist of the following (in thousands):
|  | December 31, 2013 |  |  | December 31, 2012 |  |  |  |
|  | Cost |  |  | Gross Unrealized (Losses) |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Fair Value Category |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 409 |  |  | $ | 1 |  |  | $ | 410 |  |  |  | 2 |
VRDN |  |  | 10,000 |  |  |  | 0 |  |  |  | 10,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 2 |
Corporate bonds |  |  | 9,800 |  |  |  | (13 | ) |  |  | 9,787 |  |  |  | 14,764 |  |  |  | 16 |  |  |  | 14,780 |  |  |  | 2 |
U.S. Treasuries |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,555 |  |  |  | 3 |  |  |  | 1,558 |  |  |  | 1 |
|  | $ | 19,800 |  |  | $ | (13 | ) |  | $ | 19,787 |  |  | $ | 16,728 |  |  | $ | 20 |  |  | $ | 16,748 |  |  |  |  |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 4,074 |  |  | $ | (17 | ) |  | $ | 4,057 |  |  | $ | 292 |  |  | $ | 1 |  |  | $ | 293 |  |  |  | 2 |
Corporate bonds |  |  | 1,879 |  |  |  | (27 | ) |  |  | 1,852 |  |  |  | 9,111 |  |  |  | 28 |  |  |  | 9,139 |  |  |  | 2 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 467 |  |  |  | 0 |  |  |  | 467 |  |  |  | 2 |
|  | $ | 5,953 |  |  | $ | (44 | ) |  | $ | 5,909 |  |  | $ | 9,870 |  |  | $ | 29 |  |  | $ | 9,899 |  |  |
Summary of Restricted Marketable Securities Component and Workers' Compensation Deposits | The Company’s restricted marketable securities component of restricted marketable securities and workers’ compensation deposits consists of the following (in thousands):
|  | December 31, 2013 |  |  | December 31, 2012 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Fair Value Category |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 4,742 |  |  | $ | 10 |  |  | $ | 4,752 |  |  | $ | 4,920 |  |  | $ | 17 |  |  | $ | 4,937 |  |  |  | 2 |
Corporate bonds |  |  | 2,849 |  |  |  | 5 |  |  |  | 2,854 |  |  |  | 2,035 |  |  |  | 5 |  |  |  | 2,040 |  |  |  | 2 |
U.S. treasuries |  |  | 2,787 |  |  |  | 0 |  |  |  | 2,787 |  |  |  | 1,780 |  |  |  | 0 |  |  |  | 1,780 |  |  |  | 1 |
|  | $ | 10,378 |  |  | $ | 15 |  |  | $ | 10,393 |  |  | $ | 8,735 |  |  | $ | 22 |  |  | $ | 8,757 |  |  |  |  |
Schedule of Long Term Restricted Certificates of Deposit | The Company’s long term restricted certificates of deposit are summarized as follows (in thousands):
|  | December 31, 2013 |  |  | December 31, 2012 |  |  |  |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Fair Value Category |
Restricted certificates of deposit |  | $ | 12,789 |  |  | $ | 0 |  |  | $ | 12,789 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 2 |

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