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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Payment for Contingent Consideration Liability, Investing Activities |  |  |  | $ (4,250) |
Sales |  | $ 257,856 | $ 238,500 | 763,098 | $ 690,654
Payments to Acquire Property, Plant, and Equipment |  |  |  | $ 25,078 | $ 37,245
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 172.10% | 14.70%
Futura Industries [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Contract Price | $ 92,000 |  |  |  |
Business Combination, Consideration Transferred | 87,000 |  |  |  |
Business Combination, Contingent Consideration, Asset, Current |  |  |  | $ 5,000 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset |  |  |  |  | $ 700
Business Combinations Purchase Price Allocated Net of Contingent Consideration | $ 82,860 |  |  |  |
Payment for Contingent Consideration Liability, Investing Activities |  |  |  | 4,300 |
Tax Recovery Life of Goodwill for Amortization | 15 years |  |  |  |
Percentage of outstanding equity interests acquired | 100.00% |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | 100 |  |
Aluminum Extrusions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Sales |  | 147,661 | 122,149 | 420,455 | 344,956
Income Loss From Ongoing Operations |  | $ 11,730 | $ 12,601 | $ 35,086 | $ 34,201
Customer Relationships [Member] | Futura Industries [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |  |  |  |
Trade Names [Member] | Futura Industries [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 13 years |  |  |  |

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