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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Marketable Securities [Abstract] |
Held-to-Maturity Securities | The Company's investment in marketable securities as of December 31, 2012 and 2013 are classified as "held-to-maturity" and consist of the following:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  |  |  |  | unrealized |  |  | unrealized |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Aggregate |
|  | cost basis** |  |  | gains |  |  | (losses) |  |  | fair value* |
|  | US$ thousands |
At December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and |  |  |  |  |  |  |  |  |  |  |  |
government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 15,015 |  |  |  | 20 |  |  |  | (76 | ) |  |  | 14,959 |
Non-Current |  |  | 24,617 |  |  |  | 69 |  |  |  | (167 | ) |  |  | 24,519 |
|  |  | 39,632 |  |  |  | 89 |  |  |  | (243 | ) |  |  | 39,478 |
At December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 12,702 |  |  |  | 23 |  |  |  | (56 | ) |  |  | 12,669 |
Non-Current |  |  | 28,775 |  |  |  | 193 |  |  |  | (126 | ) |  |  | 28,842 |
|  |  | 41,477 |  |  |  | 216 |  |  |  | (182 | ) |  |  | 41,511 |
* | Fair value is being determined using quoted market prices in active markets (Level 1).
** | Including accrued interest in the amount of $425K and $391K as of December 31, 2012 and 2013 respectively.
Schedule of Debt Securities by Major Interest Type | The amortized cost, gross unrealized losses and fair value of the debt securities by major interest type, mostly fixed interest, were as follows:
|  | December 31, 2013 |
|  |  |  |  | Net unrealized |  |  |  |
|  |  |  |  | holding |  |  |  |
|  | Amortized cost |  |  | gains/(losses) |  |  | Fair value |
|  | US$ thousands |
Up to 2% |  |  | 34,945 |  |  |  | (217 | ) |  |  | 34,728 |
2.05% - 2.951% |  |  | 4,687 |  |  |  | 63 |  |  |  | 4,750 |
|  |  | 39,632 |  |  |  | (154 | ) |  |  | 39,478 |
|  | December 31, 2012 |
|  |  |  |  | Net unrealized |  |  |  |
|  |  |  |  | holding |  |  |  |
|  | Amortized cost |  |  | gains/(losses) |  |  | Fair value |
|  | US$ thousands |
Up to 2% |  |  | 33,145 |  |  |  | (84 | ) |  |  | 33,061 |
2.038% - 2.951% |  |  | 8,332 |  |  |  | 118 |  |  |  | 8,450 |
|  |  | 41,477 |  |  |  | 34 |  |  |  | 41,511 |
Schedule of Reconciliation of Marketable Securities |
Activity in marketable securities in 2013 |  | US$ thousands |
Balance at January 1, 2013 |  |  | 41,477 |
Purchases of marketable securities |  |  | 11,384 |
Discount of marketable securities |  |  | (729 | )
Proceeds from maturity of marketable securities |  |  | (12,500 | )
Balance at December 31, 2013 |  |  | 39,632 |
Summary of Investment Securities in an Unrealized Loss Position | The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair value of those securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2013:
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
Held to maturity |  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
and government debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  |  | (144 | ) |  |  | 19,313 |  |  |  | (99 | ) |  |  | 8,112 |  |  |  | (243 | ) |  |  | 27,425 |

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