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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 106,648 | $ 58,909
Gross Unrealized Gains |  |
Gross Unrealized Gains | 144 | 164
Gross Unrealized Losses |  |
Gross Unrealized Losses | 42 | 8
Fair Value |  |
Fair Value | 106,750 | 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 | 21,016 | 15,566
Maturing after one year through three years | 17,470 | 19,797
Amortized cost | 38,486 | 35,363
Gross Unrealized Gains |  |
Maturing in one year or less | 30 | 28
Maturing after one year through three years | 84 | 99
Gross Unrealized Gains | 114 | 127
Gross Unrealized Losses |  |
Maturing after one year through three years | 1 | 1
Gross Unrealized Losses | 1 | 1
Fair Value |  |
Maturing in one year or less | 21,046 | 15,594
Maturing after one year through three years | 17,553 | 19,895
Fair Value | 38,599 | 35,489
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 23,909 | 17,353
Maturing after one year through three years | 44,253 | 6,193
Amortized cost | 68,162 | 23,546
Gross Unrealized Gains |  |
Maturing in one year or less | 24 | 23
Maturing after one year through three years | 6 | 14
Gross Unrealized Gains | 30 | 37
Gross Unrealized Losses |  |
Maturing in one year or less | 10 | 4
Maturing after one year through three years | 31 | 3
Gross Unrealized Losses | 41 | 7
Fair Value |  |
Maturing in one year or less | 23,923 | 17,372
Maturing after one year through three years | 44,228 | 6,204
Fair Value | $ 68,151 | $ 23,576

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