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Organization And Summary Of Significant Accounting Policies - Income Statement Impact (Details) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 180,845 | $ 311,059 | $ 209,887 | $ 463,054 | $ 468,202
Research and development | $ 373 | $ 1,329 | $ 933 | $ 821 | $ 649 | $ 500 | $ 760 | $ 625 | 1,083 | 1,010 | 1,754 | 3,456 | 2,534
Selling and administrative expenses | 15,388 | 13,294 | 12,169 | 11,655 | 19,377 | 12,115 | 13,326 | 13,697 | 23,768 | 32,115 | 23,824 | 52,506 | 58,515
Other expense (income), net | (6,426) | (405) | 1,423 | 3,304 | (4,121) | (104) | (738) | 697 | $ (813) | $ 1,031 | 4,727 | (2,104) | (4,266)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  | 210,289 | 462,848 | 466,990
Research and development | (159) | 1,338 | 943 | 829 | 436 | 526 | 786 | 651 |  |  | 1,772 | 2,951 | 2,399
Selling and administrative expenses | 12,279 | 13,322 | 12,195 | 11,683 | 18,352 | 12,215 | 13,423 | 13,794 |  |  | 23,878 | 49,479 | 57,784
Other expense (income), net | (1,976) | (643) | 1,186 | 3,067 | (660) | (567) | (1,198) | 237 |  |  | 4,253 | 1,634 | (2,188)
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development | 532 | (9) | (10) | (8) | 213 | (26) | (26) | (26) |  |  |  |  |
Selling and administrative expenses | 3,109 | (28) | (26) | (28) | 1,025 | (100) | (97) | (97) |  |  |  |  |
Other expense (income), net | $ (4,450) | $ 238 | 237 | $ 237 | $ (3,461) | $ 463 | $ 460 | $ 460 |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | (201) |  |  |  |  |  |  |  | (402) | 206 | 1,212
Research and development |  |  | (10) |  |  |  |  |  |  |  | (18) | 505 | 135
Selling and administrative expenses |  |  | (26) |  |  |  |  |  |  |  | (54) | 3,027 | 731
Other expense (income), net |  |  | $ 237 |  |  |  |  |  |  |  | $ 474 | $ (3,738) | $ (2,078)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + 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 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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