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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value Measurement [Abstract] |
Summary of marketable securities consist of investments | Marketable securities consist of the following (in thousands):
|  | December 31, 2012 |  |  | December 31, 2011 |  |  |  |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Recorded Basis |  |  | Fair Value Category |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 409 |  |  | $ | 1 |  |  | $ | 410 |  |  | $ | 5,804 |  |  | $ | 8 |  |  | $ | 5,812 |  |  |  | 2 |
Corporate bonds |  |  | 14,764 |  |  |  | 16 |  |  |  | 14,780 |  |  |  | 11,070 |  |  |  | (4 | ) |  |  | 11,066 |  |  |  | 2 |
U.S. Treasuries |  |  | 1,555 |  |  |  | 3 |  |  |  | 1,558 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1 |
|  | $ | 16,728 |  |  | $ | 20 |  |  | $ | 16,748 |  |  | $ | 16,874 |  |  | $ | 4 |  |  | $ | 16,878 |  |  |  |  |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 292 |  |  | $ | 1 |  |  | $ | 293 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 2 |
Corporate bonds |  |  | 9,111 |  |  |  | 28 |  |  |  | 9,139 |  |  |  | 14,971 |  |  |  | (33 | ) |  |  | 14,938 |  |  |  | 2 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 467 |  |  |  | 0 |  |  |  | 467 |  |  |  | 457 |  |  |  | 0 |  |  |  | 457 |  |  |  | 2 |
|  | $ | 9,870 |  |  | $ | 29 |  |  | $ | 9,899 |  |  | $ | 15,428 |  |  | $ | (33 | ) |  | $ | 15,395 |  |  |  |  |
Summary of company's restricted marketable securities 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, 2012 |  |  | December 31, 2011 |  |  |  |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Recorded Basis |  |  | Fair Value Category |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 4,920 |  |  | $ | 17 |  |  | $ | 4,937 |  |  | $ | 5,580 |  |  | $ | 17 |  |  | $ | 5,597 |  |  |  | 2 |
Corporate bonds |  |  | 2,035 |  |  |  | 5 |  |  |  | 2,040 |  |  |  | 148 |  |  |  | (1 | ) |  |  | 147 |  |  |  | 2 |
U.S. treasuries |  |  | 1,780 |  |  |  | 0 |  |  |  | 1,780 |  |  |  | 1,567 |  |  |  | 0 |  |  |  | 1,567 |  |  |  | 1 |
|  | $ | 8,735 |  |  | $ | 22 |  |  | $ | 8,757 |  |  | $ | 7,295 |  |  | $ | 16 |  |  | $ | 7,311 |  |  |  |  |

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- Definition Company's restricted marketable securities. + References No definition available. + Details
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- Definition Marketable securities consist investments. + References No definition available. + Details
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