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MARKETABLE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 58,909 | $ 41,348
Gross Unrealized Gains |  |
Gross Unrealized Gains | 164 | 147
Gross Unrealized Losses |  |
Gross Unrealized Losses | 8 | 82
Fair Value |  |
Fair Value | 59,065 | 41,413
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 15,566 | 19,993
Maturing after one year through three years | 19,797 | 10,808
Amortized cost | 35,363 | 30,801
Gross Unrealized Gains |  |
Maturing in one year or less | 28 | 20
Maturing after one year through three years | 99 | 122
Gross Unrealized Gains | 127 | 142
Gross Unrealized Losses |  |
Maturing after one year through three years | 1 | 6
Gross Unrealized Losses | 1 | 6
Fair Value |  |
Maturing in one year or less | 15,594 | 20,013
Maturing after one year through three years | 19,895 | 10,924
Fair Value | 35,489 | 30,937
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 17,353 | 5,817
Maturing after one year through three years | 6,193 | 4,730
Amortized cost | 23,546 | 10,547
Gross Unrealized Gains |  |
Maturing in one year or less | 23 | 3
Maturing after one year through three years | 14 | 2
Gross Unrealized Gains | 37 | 5
Gross Unrealized Losses |  |
Maturing in one year or less | 4 | 4
Maturing after one year through three years | 3 | 72
Gross Unrealized Losses | 7 | 76
Fair Value |  |
Maturing in one year or less | 17,372 | 5,816
Maturing after one year through three years | 6,204 | 4,660
Fair Value | $ 23,576 | $ 10,476

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