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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Summary of Marketable Securities Consist of Investments | Marketable securities consist of the following (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |  |  | Fair Value Category |
|  | Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized (Losses) |  |  | Recorded Basis |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VRDN |  | $ | 21,670 |  |  | $ | 0 |  |  | $ | 21,670 |  |  | $ | 10,000 |  |  | $ | 0 |  |  | $ | 10,000 |  |  |  | 2 |
Certificates of deposit |  |  | 8,330 |  |  |  | (43 | ) |  |  | 8,287 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 2 |
Corporate bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 9,800 |  |  |  | (13 | ) |  |  | 9,787 |  |  |  | 2 |
|  | $ | 30,000 |  |  | $ | (43 | ) |  | $ | 29,957 |  |  | $ | 19,800 |  |  | $ | (13 | ) |  | $ | 19,787 |  |  |  |  |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 3,843 |  |  | $ | 7 |  |  | $ | 3,850 |  |  | $ | 4,074 |  |  | $ | (17 | ) |  | $ | 4,057 |  |  |  | 2 |
Corporate bonds |  |  | 2,153 |  |  |  | (3 | ) |  |  | 2,150 |  |  |  | 1,879 |  |  |  | (27 | ) |  |  | 1,852 |  |  |  | 2 |
Certificates of deposit |  |  | 14,944 |  |  |  | (14 | ) |  |  | 14,930 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 2 |
|  | $ | 20,940 |  |  | $ | (10 | ) |  | $ | 20,930 |  |  | $ | 5,953 |  |  | $ | (44 | ) |  | $ | 5,909 |  |  |  |  |
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, 2014 |  |  | December 31, 2013 |  |  | Fair Value Category |
|  | Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds held in trust |  | $ | 3,776 |  |  | $ | 0 |  |  | $ | 3,776 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 2 |
|  | $ | 3,776 |  |  | $ | 0 |  |  | $ | 3,776 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  |  |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds held in trust |  | $ | 46,310 |  |  | $ | 0 |  |  | $ | 46,310 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  |  | 2 |
Municipal bonds |  |  | 4,352 |  |  |  | 21 |  |  |  | 4,373 |  |  |  | 4,742 |  |  |  | 10 |  |  |  | 4,752 |  |  |  | 2 |
Corporate bonds |  |  | 3,540 |  |  |  | (3 | ) |  |  | 3,537 |  |  |  | 2,849 |  |  |  | 5 |  |  |  | 2,854 |  |  |  | 2 |
U.S. treasuries |  |  | 3,963 |  |  |  | 0 |  |  |  | 3,963 |  |  |  | 2,787 |  |  |  | 0 |  |  |  | 2,787 |  |  |  | 1 |
|  | $ | 58,165 |  |  | $ | 18 |  |  | $ | 58,183 |  |  | $ | 10,378 |  |  | $ | 15 |  |  | $ | 10,393 |  |  |  |  |
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, 2014 |  |  | December 31, 2013 |  |  |  |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Cost |  |  | Gross Unrealized Gains |  |  | Recorded Basis |  |  | Fair Value Category |
Restricted certificates of deposit |  | $ | 114,335 |  |  | $ | 0 |  |  | $ | 114,335 |  |  | $ | 12,789 |  |  | $ | 0 |  |  | $ | 12,789 |  |  |  | 2 |

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