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Business segments - Geography, Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 383,915 | $ 454,540 | $ 523,491 | $ 587,911 | $ 551,239 | $ 500,632 | $ 458,324 | $ 420,847 | $ 1,949,857 | $ 1,931,042 | $ 1,454,313
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,373,714 | 1,370,570 | 1,022,081
Long-Lived Assets | 408,722 |  |  |  | 497,057 |  |  |  | 408,722 | 497,057 | 392,424
Iceland [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 576,143 | 560,472 | 432,232
Long-Lived Assets | 801,268 |  |  |  | 831,507 |  |  |  | 801,268 | 831,507 | 853,636
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 94,421 |  |  |  | $ 95,752 |  |  |  | $ 94,421 | $ 95,752 | $ 93,075

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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