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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Payment for Contingent Consideration Liability, Investing Activities |  |  |  |  | $ (4,250) |
Sales |  | $ 263,759 |  | $ 247,347 | 522,470 | $ 468,372
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | $ 14,528 | $ 26,692
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  | 23.00% | 9.90%
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 |  | $ 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] |  |  |  |  |  |
Income Loss From Ongoing Operations |  | $ 13,156 |  | $ 11,772 | $ 23,355 | $ 21,601
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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