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Marketable Securities (Held-To-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 39,632 | [1] | $ 41,477 | [1]
Gross unrealized holding gains | 89 |  | 216 |
Gross unrealized holding (losses) | (243) |  | (182) |
Aggregate fair value | 39,478 | [2] | 41,511 | [2]
Accrued interest on securities | 391 |  | 425 |
Current [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 15,015 | [1] | 12,702 | [1]
Gross unrealized holding gains | 20 |  | 23 |
Gross unrealized holding (losses) | (76) |  | (56) |
Aggregate fair value | 14,959 | [2] | 12,669 | [2]
Non Current [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 24,617 | [1] | 28,775 | [1]
Gross unrealized holding gains | 69 |  | 193 |
Gross unrealized holding (losses) | (167) |  | (126) |
Aggregate fair value | $ 24,519 | [2] | $ 28,842 | [2]
[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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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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