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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair Value of Financial Instruments
Money Market Funds	$ 34,996	$ 16,528
Securities	512,833
Total Fair Value	528,465	351,975
Transfers from level 1 to level 2	0		$ 0
Transfers from level 2 to level 1	0		$ 0
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	15,632	5,175
Corporate Securities
Fair Value of Financial Instruments
Securities	98,028	123,270
Government Securities
Fair Value of Financial Instruments
Securities	414,805	223,530
Level 1
Fair Value of Financial Instruments
Total Fair Value	15,632	5,175
Level 1 | Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	15,632	5,175
Level 2
Fair Value of Financial Instruments
Total Fair Value	512,833	346,800
Level 2 | Corporate Securities
Fair Value of Financial Instruments
Securities	98,028	123,270
Level 2 | Government Securities
Fair Value of Financial Instruments
Securities	$ 414,805	$ 223,530

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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