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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 121,862 | $ 58,909
Gross Unrealized Gains |  |
Gross Unrealized Gains | 117 | 164
Gross Unrealized Losses |  |
Gross Unrealized Losses | (17) | (8)
Fair Value |  |
Fair Value | 121,962 | 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 | 50,900 | 15,566
Maturing after one year through three years | 14,104 | 19,797
Amortized cost | 65,004 | 35,363
Gross Unrealized Gains |  |
Maturing in one year or less | 32 | 28
Maturing after one year through three years | 63 | 99
Gross Unrealized Gains | 95 | 127
Gross Unrealized Losses |  |
Maturing in one year or less | (3) |
Maturing after one year through three years | (2) | (1)
Gross Unrealized Losses | (5) | (1)
Fair Value |  |
Maturing in one year or less | 50,929 | 15,594
Maturing after one year through three years | 14,165 | 19,895
Fair Value | 65,094 | 35,489
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 36,001 | 17,353
Maturing after one year through three years | 20,857 | 6,193
Amortized cost | 56,858 | 23,546
Gross Unrealized Gains |  |
Maturing in one year or less | 13 | 23
Maturing after one year through three years | 9 | 14
Gross Unrealized Gains | 22 | 37
Gross Unrealized Losses |  |
Maturing in one year or less | (4) | (4)
Maturing after one year through three years | (8) | (3)
Gross Unrealized Losses | (12) | (7)
Fair Value |  |
Maturing in one year or less | 36,010 | 17,372
Maturing after one year through three years | 20,858 | 6,204
Fair Value | $ 56,868 | $ 23,576

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