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Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | $ 5,307 | $ 32,286
Revenue, Net | 349,637 | 305,907
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 65 | 0
Goodwill, Acquired During Period | 2,086 |
Screw Products [Member] |  |
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | 5,150 |
Finite-Lived Customer Relationships, Gross | 2,580 |
Finite-Lived Trade Names, Gross | 470 |
Revenue, Net | 600 |
Goodwill, Acquired During Period | $ 1,929 |
Bolt [Member] [Member] |  |
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross |  | 32,286
Finite-Lived Customer Relationships, Gross |  | 4,186
Finite-Lived Trade Names, Gross |  | 7,241
Goodwill, Acquired During Period |  | $ 14,176
Trade Names [Member] | Screw Products [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |
Trade Names [Member] | Bolt [Member] [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |
Customer Relationships [Member] | Screw Products [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Customer Relationships [Member] | Bolt [Member] [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |

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