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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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Significant Accounting Policies - Concentrations (Details) $ in Thousands	Mar. 31, 2019 USD ($) issuer	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Concentration risk
Investments - debt securities	$ 9,817	$ 8,958
Investments - equity securities	38,186	36,132
Cash and cash equivalents	190,821	$ 195,155	$ 202,585
U.S. Treasury securities
Concentration risk
Investments - debt securities	7,000
Preferred stock
Concentration risk
Investments - equity securities	38,200
Commercial paper
Concentration risk
Cash and cash equivalents	$ 168,100
Number of issuers \| issuer	20
Non-investment grade \| Corporate debt securities
Concentration risk
Investments - debt securities	$ 2,800
Number of issuers \| issuer	2
Non-investment grade \| Preferred stock
Concentration risk
Number of issuers \| issuer	5
Investment grade \| Preferred stock
Concentration risk
Number of issuers \| issuer	1