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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Significant Accounting Policies - Concentrations (Details) $ in Thousands	Dec. 31, 2019 USD ($) issuer	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Concentration risk
Investments - debt securities	$ 53	$ 8,958
Investments - equity securities	9,746	36,132
Cash and cash equivalents	185,716	$ 195,155	$ 192,083
Credit concentration risk \| Assets
Concentration risk
Cash amount not insured by FDIC	22,400
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	7,000
Credit concentration risk \| Assets \| Corporate debt securities \| Non-investment grade
Concentration risk
Investments - debt securities	$ 100
Number of issuers \| issuer	1
Credit concentration risk \| Assets \| Preferred stock \| Non-investment grade
Concentration risk
Investments - equity securities	$ 9,700
Number of issuers \| issuer	4
Credit concentration risk \| Assets \| Preferred stock \| Investment grade
Concentration risk
Number of issuers \| issuer	1
Credit concentration risk \| Assets \| Commercial paper
Concentration risk
Cash and cash equivalents	$ 138,200
Number of issuers \| issuer	20