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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Significant Accounting Policies - Concentrations (Details) $ in Thousands	Dec. 31, 2018 USD ($) issuer	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Concentration risk
Cash amount not insured by FDIC	$ 15,900
Investments - debt securities	8,958	$ 76,245
Investments - equity securities	36,132
Cash and cash equivalents	195,155	$ 192,083	$ 241,111
U.S. Treasury securities
Concentration risk
Investments - debt securities	6,900
Cash and cash equivalents	30,000
Commercial paper
Concentration risk
Cash and cash equivalents	$ 107,600
Number of issuers \| issuer	11
Non-investment grade \| Corporate debt securities
Concentration risk
Investments - debt securities	$ 2,000
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