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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 12,166,126,000	$ 12,263,240,000
Fixed maturities, available for sale, allowance for credit loss	20,019,000	0
Equity securities, cost	390,941,000	398,956,000
Credit losses associated with commercial mortgage loans	0	0
Allowance for credit loss	7,924,000	7,000,000
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 18,954,000	$ 18,000,000
Common shares, shares issued (in shares)	176,580	176,580	176,580	176,580
Common shares, shares outstanding (in shares)	84,298	83,959	83,934
Treasury shares, shares (in shares)	92,282	92,621	92,646	92,994

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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