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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant & Equipment: |  |  |
Depreciation expense | $ 6,190,000 | $ 6,217,000 | $ 5,955,000
Capitalized interest expense | 7,000 | 0 |
Goodwill, Impairment Loss | 0 | 0 | 0
Asset Impairment Charges | 0 | 0 | $ 0
Allowance for Doubtful Accounts Receivable, Current | $ 0 | $ 0 |
Land improvements |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 20 years |  |
Buildings and improvements | Minimum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 20 years |  |
Buildings and improvements | Maximum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 40 years |  |
Machinery and equipment | Minimum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 3 years |  |
Machinery and equipment | Maximum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 15 years |  |
Tools, dies and patterns | Minimum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 3 years |  |
Tools, dies and patterns | Maximum [Member] |  |  |
Property, Plant & Equipment: |  |  |
Useful life | 5 years |  |

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