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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 and 2015 (U.S. dollars in thousands):
|  | Fair Value at December 31, 2014 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets (liabilities): |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and current investments |  | $ | 86,574 |  |  | $ | ─ |  |  | $ | ─ |  |  | $ | 86,574 |
Forward contracts |  | ─ |  |  |  | 1,661 |  |  | ─ |  |  |  | 1,661 |
Life insurance contracts |  | ─ |  |  | ─ |  |  |  | 26,280 |  |  |  | 26,280 |
Total |  | $ | 86,574 |  |  | $ | 1,661 |  |  | $ | 26,280 |  |  | $ | 114,515 |
|  | Fair Value at December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets (liabilities): |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and current investments |  | $ | 47,121 |  |  | $ | ─ |  |  | $ | ─ |  |  | $ | 47,121 |
Forward contracts |  | ─ |  |  |  | 485 |  |  | ─ |  |  |  | 485 |
Life insurance contracts |  | ─ |  |  | ─ |  |  |  | 27,292 |  |  |  | 27,292 |
Total |  | $ | 47,121 |  |  | $ | 485 |  |  | $ | 27,292 |  |  | $ | 74,898 |
Changes in Fair Value of Level 3 Marketable Securities | The following table provides a summary of changes in fair value of the Company's Level 3 marketable securities (U.S. dollars in thousands):
Life Insurance Contracts |  | 2014 |  |  | 2015 |
Beginning balance at January 1 |  | $ | 23,172 |  |  | $ | 26,280 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date |  |  | 1,249 |  |  |  | (1,597 | )
Purchases and issuances |  |  | 2,798 |  |  |  | 3,025 |
Sales and settlements |  |  | (939 | ) |  |  | (416 | )
Transfers into Level 3 |  | ─ |  |  | ─ |
Ending balance at December 31 |  | $ | 26,280 |  |  | $ | 27,292 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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