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Financial Instruments Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | $ 289,938 | [1] | $ 2,660
Available-for-sale securities | 52,683 |  | 37,915
Interest rate swaps - asset |  |  | 152
Interest rate swaps - liability | (149) |  |
Foreign exchange contracts - asset | 5,499 |  | 4,685
Foreign exchange contracts - liability | (8,581) |  | (3,444)
Contingent consideration | (3,176) |  | (4,027)
Total Fair Value Assets And Liabilities Measured On Recurring Basis | 336,214 |  | 37,941
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 3,267 |  | 2,660
Available-for-sale securities | 52,683 |  | 37,915
Interest rate swaps - asset |  |  | 0
Interest rate swaps - liability | 0 |  |
Foreign exchange contracts - asset | 0 |  | 0
Foreign exchange contracts - liability | 0 |  | 0
Contingent consideration | 0 |  | 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis | 55,950 |  | 40,575
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 286,671 | [1] | 0
Available-for-sale securities | 0 |  | 0
Interest rate swaps - asset |  |  | 152
Interest rate swaps - liability | (149) |  |
Foreign exchange contracts - asset | 5,499 |  | 4,685
Foreign exchange contracts - liability | (8,581) |  | (3,444)
Contingent consideration | 0 |  | 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis | 283,440 |  | 1,393
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 0 |  | 0
Available-for-sale securities | 0 |  | 0
Interest rate swaps - asset |  |  | 0
Interest rate swaps - liability | 0 |  |
Foreign exchange contracts - asset | 0 |  | 0
Foreign exchange contracts - liability | 0 |  | 0
Contingent consideration | (3,176) |  | (4,027)
Total Fair Value Assets And Liabilities Measured On Recurring Basis | $ (3,176) |  | $ (4,027)
[1] | Cash equivalents include $286,671 invested in certificates of deposit, with an original maturity of less than three months, held in anticipation of our acquisition of eInfochips, which closed in January 2018 (see Note 19).

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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