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Acquisitions (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Sales |  | $ 247,121,000 |  | $ 207,702,000 | $ 715,494,000 | $ 623,569,000
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | $ 37,245,000 | $ 30,912,000
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  | 14.70% | 7.60%
Futura Industries [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combinations Accretion to Diluted Earnings Per Share |  | 0.04 |  |  | $ 0.09 |
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 |  |  |
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 |  | 12,601,000 |  | 9,427,000 | $ 34,201,000 | $ 27,786,000
Futura Industries [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 247,121,000 |  | 228,176,000 | 722,505,000 | 681,686,000
Sales |  | 21,215,000 |  |  | 51,966,000 |
Income Loss From Ongoing Operations |  | 2,400,000 |  |  | 6,200,000 |
Cost of Services, Depreciation and Amortization |  | 1,700,000 |  |  | 3,600,000 |
Payments to Acquire Property, Plant, and Equipment |  | 500,000 |  |  | 1,300,000 |
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 8,274,000 |  | $ 13,225,000 | $ 55,835,000 | $ 25,559,000
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 0.25 |  | $ 0.40 | $ 1.69 | $ 0.78
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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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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