Investments (Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Equity security	$ 19,369	$ 16,033
Stock Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	2,498	3,274
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	11,134	12,311
Common stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	1,040	134
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	$ 4,697	$ 314