Investments (Realized Gains (Losses)) (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	$ 527,000	$ 72,000		$ 669,000	$ 3,164,000
Sale of other long-term investments and real estate				0	6,981,000
Gains (Losses) on Sales of Investment Real Estate			$ 5,500,000
Proceeds from Sale of Debt Securities, Available-for-sale				$ 17,524,000	$ 39,708,000
Sale of bonds, number of available-for-sale securities sold	18	21		24	41
Number of Equity Securities Sold	0	0		0	0
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	$ 400,000	$ 18,000.0		$ 600,000	$ 800,000
Debt Securities [Member]
Gain (Loss) on Securities [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	11,221,000	29,294,000		17,524,000	39,708,000
Available-for-sale Securities, Gross Realized Gains	25,000	125,000		148,000	234,000
Available-for-sale Securities, Gross Realized Losses	$ 77,000	$ 22,000		$ 134,000	$ 387,000
Real Estate [Member]
Gain (Loss) on Securities [Line Items]
Sale of other long-term investments and real estate			$ 7,500,000

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The number of securities classified as available-for-sale sold by the Company.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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