Investments (Available For Sale Equity Investments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Equity investments:
Estimated market value, equity investments	$ 25,603
Common stocks [Member]
Equity investments:
Estimated market value, equity investments	18,298
Non-redeemable preferred stocks [Member]
Equity investments:
Estimated market value, equity investments	$ 7,305