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MARKETABLE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 133,499 | $ 58,909
Gross Unrealized Gains |  |
Gross Unrealized Gains | 104 | 164
Gross Unrealized Losses |  |
Gross Unrealized Losses | (22) | (8)
Fair Value |  |
Fair Value | 133,581 | 59,065
Marketable securities considered to be other-than-temporarily impaired | 0 |
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 55,531 | 15,566
Maturing after one year through three years | 18,234 | 19,797
Amortized cost | 73,765 | 35,363
Gross Unrealized Gains |  |
Maturing in one year or less | 27 | 28
Maturing after one year through three years | 56 | 99
Gross Unrealized Gains | 83 | 127
Gross Unrealized Losses |  |
Maturing in one year or less | (4) |
Maturing after one year through three years | (4) | (1)
Gross Unrealized Losses | (8) | (1)
Fair Value |  |
Maturing in one year or less | 55,554 | 15,594
Maturing after one year through three years | 18,286 | 19,895
Fair Value | 73,840 | 35,489
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 38,973 | 17,353
Maturing after one year through three years | 20,761 | 6,193
Amortized cost | 59,734 | 23,546
Gross Unrealized Gains |  |
Maturing in one year or less | 9 | 23
Maturing after one year through three years | 12 | 14
Gross Unrealized Gains | 21 | 37
Gross Unrealized Losses |  |
Maturing in one year or less | (9) | (4)
Maturing after one year through three years | (5) | (3)
Gross Unrealized Losses | (14) | (7)
Fair Value |  |
Maturing in one year or less | 38,973 | 17,372
Maturing after one year through three years | 20,768 | 6,204
Fair Value | $ 59,741 | $ 23,576

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