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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 129,121 | $ 58,909
Gross Unrealized Gains |  |
Gross Unrealized Gains | 86 | 164
Gross Unrealized Losses |  |
Gross Unrealized Losses | 124 | 8
Fair Value |  |
Fair Value | 129,083 | 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 | 34,189 | 15,566
Maturing after one year through three years | 34,030 | 19,797
Amortized cost | 68,219 | 35,363
Gross Unrealized Gains |  |
Maturing in one year or less | 15 | 28
Maturing after one year through three years | 61 | 99
Gross Unrealized Gains | 76 | 127
Gross Unrealized Losses |  |
Maturing in one year or less | 5 |
Maturing after one year through three years | 22 | 1
Gross Unrealized Losses | 27 | 1
Fair Value |  |
Maturing in one year or less | 34,199 | 15,594
Maturing after one year through three years | 34,069 | 19,895
Fair Value | 68,268 | 35,489
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 33,336 | 17,353
Maturing after one year through three years | 27,566 | 6,193
Amortized cost | 60,902 | 23,546
Gross Unrealized Gains |  |
Maturing in one year or less | 10 | 23
Maturing after one year through three years |  | 14
Gross Unrealized Gains | 10 | 37
Gross Unrealized Losses |  |
Maturing in one year or less | 32 | 4
Maturing after one year through three years | 65 | 3
Gross Unrealized Losses | 97 | 7
Fair Value |  |
Maturing in one year or less | 33,314 | 17,372
Maturing after one year through three years | 27,501 | 6,204
Fair Value | $ 60,815 | $ 23,576

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