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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Freight | $ 8,440 | $ 7,912 | $ 17,229 | $ 16,218
Net Sales | 255,319 | 239,435 | 505,241 | 452,154
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 171,185 | 154,710 | 330,747 | 284,611
PE Films |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 82,457 | 89,639 | 175,707 | 176,050
PE Films | Personal Care Materials [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 55,985 | 62,790 | 117,629 | 124,088
PE Films | Surface Protection Films [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 24,918 | 24,996 | 54,733 | 48,437
PE Films | Films For Other Markets [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 1,555 | 1,853 | 3,345 | 3,526
PE Films | Film Products Subtotal [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 82,458 | 89,639 | 175,707 | 176,051
Flexible Packaging Films [Member] [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 28,304 | 26,588 | 56,741 | 53,297
Aluminum Extrusions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 144,558 | 123,208 | 272,793 | 222,807
Aluminum Extrusions | Nonresidential Building And Construction [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 72,442 | 61,173 | 137,629 | 114,347
Aluminum Extrusions | Consumer Durables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 17,161 | 14,024 | 32,309 | 25,766
Aluminum Extrusions | Distribution [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 12,031 | 9,408 | 22,961 | 15,842
Aluminum Extrusions | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 11,157 | 10,112 | 20,787 | 20,265
Aluminum Extrusions | Residential Building And Construction [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 12,343 | 13,068 | 21,813 | 19,528
Aluminum Extrusions | Aluminum Extrusions Subtotal [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 144,557 | 123,208 | 272,793 | 222,806
Aluminum Extrusions | Machinery and Equipment BNL [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 9,867 | 8,606 | 19,144 | 15,545
Aluminum Extrusions | Electrical [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 9,556 | 6,817 | 18,150 | 11,513
Exports From United States [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 18,884 | 21,165 | 42,476 | 39,887
Exports From United States [Member] | CANADA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 14,239 | 11,510 | 27,537 | 24,602
Exports From United States [Member] | Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 1,697 | 2,275 | 3,519 | 4,633
Exports From United States [Member] | Latin America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 3,654 | 3,991 | 6,706 | 7,721
Operations Outside United States [Member] | BRAZIL |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 23,659 | 21,294 | 46,811 | 42,653
Operations Outside United States [Member] | NETHERLANDS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 11,394 | 12,927 | 23,322 | 25,687
Operations Outside United States [Member] | HUNGARY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 8,519 | 6,138 | 17,337 | 11,329
Operations Outside United States [Member] | CHINA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 1,692 | 2,710 | 3,966 | 6,115
Operations Outside United States [Member] | INDIA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 396 | $ 2,715 | $ 2,820 | $ 4,916

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