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Acquisitions (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |
Sales |  | $ 247,347,000 | $ 208,533,000 | $ 468,372,000 | $ 415,867,000
Payments to Acquire Property, Plant, and Equipment |  |  |  | $ 26,692,000 | $ 19,018,000
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 9.90% | 29.80%
Futura Industries [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combinations Accretion to Diluted Earnings Per Share |  | 0.04 |  | $ 0.05 |
Business Combination Contract Price | $ 92,000,000 |  |  |  |
Business Combination, Consideration Transferred | 87,000,000 |  |  |  |
Business Combinations Amount Deposited in Escrow - Earnout | 5,000,000 |  |  |  |
Business Combination, Contingent Consideration, Asset, Current | 4,300,000 | 5,000,000 |  | 5,000,000 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset |  | 700,000 |  | $ 700,000 |
Business Combinations Purchase Price Allocated Net of Contingent Consideration | $ 82,860,000 |  |  |  |
Tax Recovery Life of Goodwill for Amortization | 15 years |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  | 3.00% |
Percentage of outstanding equity interests acquired | 100.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 39.10% |
Goodwill, Purchase Accounting Adjustments |  | 100,000 |  |  |
Aluminum Extrusions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Income Loss From Ongoing Operations |  | 11,772,000 | 10,859,000 | $ 21,601,000 | $ 18,359,000
Futura Industries [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 247,347 | 226,849 | 475,383 | 453,510
Sales |  | 22,465,000 |  | 30,751,000 |
Income Loss From Ongoing Operations |  | 2,800,000 |  | 3,800,000 |
Cost of Services, Depreciation and Amortization |  | 1,400,000 |  | 1,900,000 |
Payments to Acquire Property, Plant, and Equipment |  | 500,000 |  | 900,000 |
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 44,204 | $ 4,202 | $ 47,562 | $ 12,334
Business Acquisition, Pro Forma Earnings Per Share, Basic |  | $ 1.34 | $ 0.13 | $ 1.44 | $ 0.38
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 1.34 | $ 0.13 | $ 1.44 | $ 0.38
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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