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Segments and Major Customers (Tables) | 12 Months Ended
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Dec. 31, 2017
Concentration Risk |
Reported segment revenues, and reported segment operating income (loss) | The tables below present reported segment operating income (loss) for the years ended December 31, 2017, 2016 and 2015:
| For the Year Ended December 31, 2017
| MID |  | RSD |  | Other |  | Total
| (In thousands)
Revenues | $ | 280,704 |  |  | $ | 96,663 |  |  | $ | 15,729 |  |  | $ | 393,096 |
Segment operating expenses | 86,044 |  |  | 50,010 |  |  | 33,860 |  |  | 169,914 |
Segment operating income (loss) | $ | 194,660 |  |  | $ | 46,653 |  |  | $ | (18,131 | ) |  | $ | 223,182 |
Reconciling items |  |  |  |  |  |  |  |  | (168,775 | )
Operating income |  |  |  |  |  |  |  |  | $ | 54,407 |
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (13,418 | )
Income before income taxes |  |  |  |  |  |  |  |  | $ | 40,989 |
| For the Year Ended December 31, 2016
| MID |  | RSD |  | Other |  | Total
| (In thousands)
Revenues | $ | 239,843 |  |  | $ | 76,175 |  |  | $ | 20,579 |  |  | $ | 336,597 |
Segment operating expense | 68,460 |  |  | 51,855 |  |  | 30,397 |  |  | 150,712 |
Segment operating income (loss) | $ | 171,383 |  |  | $ | 24,320 |  |  | $ | (9,818 | ) |  | $ | 185,885 |
Reconciling items |  |  |  |  |  |  | (152,243 | )
Operating income |  |  |  |  |  |  |  | $ | 33,642 |
Interest and other income (expense), net |  |  |  |  |  |  |  | (11,005 | )
Income before income taxes |  |  |  |  |  |  |  |  | $ | 22,637 |
| For the Year Ended December 31, 2015
| MID |  | RSD |  | Other |  | Total
| (In thousands)
Revenues | $ | 221,968 |  |  | $ | 50,497 |  |  | $ | 23,813 |  |  | $ | 296,278 |
Segment operating expenses | 47,780 |  |  | 29,056 |  |  | 32,147 |  |  | 108,983 |
Segment operating income (loss) | $ | 174,188 |  |  | $ | 21,441 |  |  | $ | (8,334 | ) |  | $ | 187,295 |
Reconciling items |  |  |  |  |  |  |  |  | (115,875 | )
Operating income |  |  |  |  |  |  |  | $ | 71,420 |
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (11,189 | )
Income before income taxes |  |  |  |  |  |  | $ | 60,231 |
Revenue from external customer by geographic regions | Revenue from customers in the geographic regions based on the location of contracting parties is as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
USA | $ | 165,263 |  |  | $ | 121,209 |  |  | $ | 118,278 |
South Korea | 115,811 |  |  | 129,542 |  |  | 115,486 |
Japan | 23,378 |  |  | 30,215 |  |  | 29,687 |
Europe | 22,597 |  |  | 16,031 |  |  | 9,616 |
Canada | 4,373 |  |  | 3,478 |  |  | 214 |
Singapore | 22,554 |  |  | 17,908 |  |  | 16,312 |
Asia-Other | 39,120 |  |  | 18,214 |  |  | 6,685 |
Total | $ | 393,096 |  |  | $ | 336,597 |  |  | $ | 296,278 |
Accounts Receivable [Member] |
Concentration Risk |
Schedule of customer accounts representing 10% or more than 10% of total revenue | Accounts receivable from the Company's major customers representing 10% or more of total accounts receivable at December 31, 2017 and December 31, 2016, respectively, was as follows:
| As of December 31,
Customer | 2017 |  | 2016
Customer 1 (MID reportable segment) | * |  |  | 13 | %
Customer 2 (Other segment) | 12 | % |  | 12 | %
Customer 3 (MID and RSD reportable segment) | 13 | % |  | * |
Customer 4 (RSD reportable segment) | * |  |  | 17 | %
Customer 5 (RSD reportable segment) | 11 | % |  | * |
_________________________________________ * Customer accounted for less than 10% of total accounts receivable in the period
Sales, net |
Concentration Risk |
Schedule of customer accounts representing 10% or more than 10% of total revenue | Revenue from the Company’s major customers representing 10% or more of total revenue for the years ended December 31, 2017, 2016 and 2015 were as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Customer A (MID and RSD reportable segments) | 17 | % |  | 19 | % |  | 20 | %
Customer B (MID reportable segment) | 13 | % |  | 20 | % |  | 19 | %
Customer C (MID reportable segment) | 13 | % |  | 13 | % |  | 13 | %

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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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