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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Total available-for-sale securities |  |
Amortized Cost | $ 116,064 | $ 120,537
Gross Unrealized Gains | 10 | 47
Gross Unrealized Losses | (24) | (12)
Estimated Fair Value | 116,050 | 120,572
Available-for-sale securities in a loss position |  |
Estimated Fair value | 68,275 | 48,070
Gross Unrealized Losses | (24) | (12)
Investments that had been in a continuous loss position for more than 12 months | 0 | 0
U.S. treasuries |  |
Total available-for-sale securities |  |
Amortized Cost | 94,935 | 81,506
Gross Unrealized Gains | 6 | 27
Gross Unrealized Losses | (23) | (6)
Estimated Fair Value | 94,918 | 81,527
Available-for-sale securities in a loss position |  |
Estimated Fair value | 64,922 | 35,001
Gross Unrealized Losses | (23) | (6)
Government agency securities |  |
Total available-for-sale securities |  |
Amortized Cost | 12,985 |
Gross Unrealized Gains | 3 |
Estimated Fair Value | 12,988 |
Corporate debt |  |
Total available-for-sale securities |  |
Amortized Cost | 8,144 | 39,031
Gross Unrealized Gains | 1 | 20
Gross Unrealized Losses | (1) | (6)
Estimated Fair Value | 8,144 | 39,045
Available-for-sale securities in a loss position |  |
Estimated Fair value | 3,353 | 13,069
Gross Unrealized Losses | $ (1) | $ (6)

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