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Marketable Securities (Schedule of Debt Securities by Major Interest Type) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Up To 2% [Member] | Dec. 31, 2013 Up To 2% [Member] Maximum [Member] | Dec. 31, 2013 2.05% - 2.951% [Member] | Dec. 31, 2013 2.05% - 2.951% [Member] Minimum [Member] | Dec. 31, 2013 2.05% - 2.951% [Member] Maximum [Member] | Dec. 31, 2012 Up to 2% [Member] | Dec. 31, 2012 Up to 2% [Member] Maximum [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] Minimum [Member] | Dec. 31, 2012 2.038% - 2.951% [Member] Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost | $ 39,632 | [1] | $ 41,477 | [1] | $ 34,945 |  | $ 4,687 |  |  | $ 33,145 |  | $ 8,332 |  |
Net unrealized holding gains/(losses) | (154) |  | 34 |  | (217) |  | 63 |  |  | (84) |  | 118 |  |
Aggregate fair value | $ 39,478 | [2] | $ 41,511 | [2] | $ 34,728 |  | $ 4,750 |  |  | $ 33,061 |  | $ 8,450 |  |
Interest rate |  |  |  |  |  | 2.00% |  | 2.05% | 2.951% |  | 2.00% |  | 2.038% | 2.951%
[1] | Including accrued interest in the amount of $425K and $391K as of December 31, 2012 and 2013 respectively.
[2] | Fair value is being determined using quoted market prices in active markets (Level 1).

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