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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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Significant Accounting Policies - Concentrations (Details) $ in Thousands	Dec. 31, 2020 USD ($) issuer	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Concentration risk
Cash and cash equivalents	$ 106,794	$ 185,716	$ 195,155
Investments - debt securities	48,051	53
Investments - equity securities	2,623	9,746
Preferred stock
Concentration risk
Investments - equity securities	2,600	$ 9,700
Credit concentration risk \| Assets
Concentration risk
Cash amount not insured by FDIC	15,600
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	79,000
Credit concentration risk \| Assets \| U.S. Treasury Bills \| Non-investment grade
Concentration risk
Investments - debt securities	48,000
Credit concentration risk \| Assets \| Money Market Funds
Concentration risk
Cash and cash equivalents	11,000
Credit concentration risk \| Assets \| Preferred stock
Concentration risk
Investments - equity securities	$ 2,600
Credit concentration risk \| Assets \| Preferred stock \| Non-investment grade
Concentration risk
Number of issuers \| issuer	3