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Environmental Compliance Costs (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2016 USD ($) solid_waste_management_units environmental_remediation_sites | Dec. 31, 2015 USD ($)
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | $ 590 | $ 551
Minimum [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation costs, period of recognition (years) | 3 years |
Maximum [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation costs, period of recognition (years) | 4 years |
Comprehensive Environmental Response, Compensation, and Liability Act [Member] |  |
Environmental Exit Cost [Line Items] |  |
Number of environmental remediation sites (sites) | environmental_remediation_sites | 1 |
Augusta Plant [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | $ 515 | 476
Bristol, Tennessee Facility [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | $ 75 | $ 75
Number of solid waste management units | solid_waste_management_units | 2 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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