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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Abstract] |  |  |
Rental expense | $ 6,507 | $ 6,043 | $ 5,464
Capital Lease Obligations Incurred | 762 |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 323,305 | 307,710 |
Less: Accumulated depreciation | (207,076) | (185,681) |
Total property, plant and equipment | 116,229 | 122,029 |
Operating Leases |  |  |
2018 | 6,832 |  |
2019 | 6,117 |  |
2020 | 3,448 |  |
2021 | 2,239 |  |
2022 | 2,099 |  |
Thereafter | 3,613 |  |
Capital Leases |  |  |
2018 | 246 |  |
2019 | 246 |  |
2020 | 116 |  |
2021 | 0 |  |
2022 | 0 |  |
Thereafter | 0 |  |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 4,027 | 4,027 |
Building and improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 91,766 | 90,780 |
Machinery and equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 219,675 | 205,674 |
Construction in progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 7,837 | $ 7,229 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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