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Marketable Securities (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 217,241,000 | $ 133,499,000
Gross Unrealized Gains |  |
Gross Unrealized Gains | 166,000 | 104,000
Gross Unrealized Losses |  |
Gross Unrealized Losses | (83,000) | (22,000)
Fair Value |  |
Fair Value | 217,324,000 | 133,581,000
Marketable securities considered to be other-than-temporarily impaired | 0 |
Accrued interest included in marketable securities | 1,300,000 | 900,000
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 40,967,000 | 55,531,000
Maturing after one year through three years | 43,248,000 | 18,234,000
Amortized cost | 84,215,000 | 73,765,000
Gross Unrealized Gains |  |
Maturing in one year or less | 32,000 | 27,000
Maturing after one year through three years | 84,000 | 56,000
Gross Unrealized Gains | 116,000 | 83,000
Gross Unrealized Losses |  |
Maturing in one year or less |  | (4,000)
Maturing after one year through three years | (23,000) | (4,000)
Gross Unrealized Losses | (23,000) | (8,000)
Fair Value |  |
Maturing in one year or less | 40,999,000 | 55,554,000
Maturing after one year through three years | 43,309,000 | 18,286,000
Fair Value | 84,308,000 | 73,840,000
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 96,375,000 | 38,973,000
Maturing after one year through three years | 36,651,000 | 20,761,000
Amortized cost | 133,026,000 | 59,734,000
Gross Unrealized Gains |  |
Maturing in one year or less | 38,000 | 9,000
Maturing after one year through three years | 12,000 | 12,000
Gross Unrealized Gains | 50,000 | 21,000
Gross Unrealized Losses |  |
Maturing in one year or less | (29,000) | (9,000)
Maturing after one year through three years | (31,000) | (5,000)
Gross Unrealized Losses | (60,000) | (14,000)
Fair Value |  |
Maturing in one year or less | 96,384,000 | 38,973,000
Maturing after one year through three years | 36,632,000 | 20,768,000
Fair Value | $ 133,016,000 | $ 59,741,000

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