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Segment Information and Major Customers (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Sales and Gross Profit of Reportable Segments | The following table presents information about the reported sales and gross profit of our reportable segments for each of the years ended December 31, 2017, 2016 and 2015. Asset information by reportable segment is not reported, since we do not produce such information internally.
Sales and Gross Profit by Market Segment |  |  |  |  |  |  |  |  |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Sales |  |  | Gross Profit |  |  | Sales |  |  | Gross Profit |  |  | Sales |  |  | Gross Profit |
Network Solutions |  | $ | 540,396 |  |  | $ | 260,855 |  |  | $ | 525,502 |  |  | $ | 254,807 |  |  | $ | 527,422 |  |  | $ | 233,579 |
Services & Support |  |  | 126,504 |  |  |  | 42,805 |  |  |  | 111,279 |  |  |  | 36,537 |  |  |  | 72,642 |  |  |  | 33,318 |
Total |  | $ | 666,900 |  |  | $ | 303,660 |  |  | $ | 636,781 |  |  | $ | 291,344 |  |  | $ | 600,064 |  |  | $ | 266,897 |
Sales Information by Product Category | The following table presents sales information by product category for the years ended December 31, 2017, 2016 and 2015:
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Access & Aggregation |  | $ | 473,943 |  |  | $ | 436,372 |  |  | $ | 405,698 |
Customer Devices |  |  | 138,456 |  |  |  | 137,608 |  |  |  | 125,565 |
Traditional & Other Products |  |  | 54,501 |  |  |  | 62,801 |  |  |  | 68,801 |
Total |  | $ | 666,900 |  |  | $ | 636,781 |  |  | $ | 600,064 |
Sales Information by Geographic Area | The following table presents sales information by geographic area for the years ended December 31, 2017, 2016 and 2015. International sales correlate to shipments with a non-U.S. destination.
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
United States |  | $ | 508,178 |  |  | $ | 501,337 |  |  | $ | 419,366 |
Germany |  |  | 119,502 |  |  |  | 85,780 |  |  |  | 111,666 |
Other international |  |  | 39,220 |  |  |  | 49,664 |  |  |  | 69,032 |
Total |  | $ | 666,900 |  |  | $ | 636,781 |  |  | $ | 600,064 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + 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=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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