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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | $ 257,856 | $ 238,500 | $ 763,098 | $ 690,654
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 176,022 | 150,154 | 506,769 | 434,766
PE Films |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 76,470 | 89,723 | 252,177 | 265,773
PE Films | Personal Care Materials [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 57,356 | 63,574 | 174,985 | 187,661
PE Films | Surface Protection Films [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 17,193 | 24,368 | 71,926 | 72,805
PE Films | Films For Other Markets [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 1,921 | 1,781 | 5,266 | 5,307
PE Films | Film Products Subtotal [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 76,470 | 89,723 | 252,177 | 265,773
Flexible Packaging Films [Member] [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 33,725 | 26,628 | 90,466 | 79,925
Aluminum Extrusions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 147,661 | 122,149 | 420,455 | 344,956
Aluminum Extrusions | Nonresidential Building And Construction [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 75,870 | 63,187 | 213,500 | 177,534
Aluminum Extrusions | Consumer Durables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 14,991 | 14,105 | 47,300 | 39,871
Aluminum Extrusions | Distribution [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 9,148 | 7,182 | 32,109 | 23,024
Aluminum Extrusions | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 13,205 | 9,682 | 33,992 | 29,947
Aluminum Extrusions | Residential Building And Construction [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 11,163 | 10,327 | 32,976 | 29,855
Aluminum Extrusions | Aluminum Extrusions Subtotal [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 147,661 | 122,149 | 420,455 | 344,956
Aluminum Extrusions | Machinery and Equipment BNL [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 11,191 | 8,430 | 30,335 | 23,975
Aluminum Extrusions | Electrical [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 12,093 | 9,236 | 30,243 | 20,750
Exports From United States [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 14,893 | 21,507 | 57,370 | 61,394
Exports From United States [Member] | CANADA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 13,451 | 11,253 | 40,988 | 35,855
Exports From United States [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 1,608 | 2,193 | 5,127 | 6,826
Exports From United States [Member] | Latin America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 3,104 | 3,841 | 9,810 | 11,562
Operations Outside United States [Member] | BRAZIL |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 26,591 | 22,030 | 73,402 | 64,682
Operations Outside United States [Member] | NETHERLANDS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 11,428 | 15,691 | 34,750 | 41,378
Operations Outside United States [Member] | HUNGARY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 7,987 | 6,331 | 25,324 | 17,660
Operations Outside United States [Member] | CHINA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | 2,376 | 3,061 | 6,342 | 9,176
Operations Outside United States [Member] | INDIA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales | $ 396 | $ 2,439 | $ 3,216 | $ 7,355

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