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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Amortized Cost and Estimated Fair Value of Investments Held to Maturity | The following summarizes the amortized cost and estimated fair value of our investments held to maturity at December 31, 2017 and December 31, 2016:
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Loss) |  | Fair Value
December 31, 2017: | (in thousands)
Current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | $ | 6,077 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 6,071 |
Non current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | — |  |  | — |  |  | — |  |  | — |
Total | $ | 6,077 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 6,071 |
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | $ | 14,083 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 14,071 |
Non current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | — |  |  | — |  |  | — |  |  | — |
Total | $ | 14,083 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 14,071 |
Estimated Useful Lives | Depreciation is computed using the straight-line method over the following estimated useful lives:
Buildings | 3-40 years
Machinery and equipment | 3-15 years
Furniture and fixtures | 3-7 years

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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