Investments Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Equity securities		$ 16,164
Equity securities	$ 15,068
Equity Funds [Member]
Investment [Line Items]
Equity securities		3,217
Equity securities	2,906
Bond Mutual Funds [Member]
Investment [Line Items]
Equity securities		12,367
Equity securities	11,774
Common Stock [Member]
Investment [Line Items]
Equity securities		24
Equity securities	94
Nonredeemable Preferred Stock [Member]
Investment [Line Items]
Equity securities	294
Preferred Stock [Member]
Investment [Line Items]
Equity securities		556
Equity Securities [Member]
Investment [Line Items]
Equity securities		$ 16,164
Equity securities	$ 15,068