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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 11,566,930,000	$ 12,263,240,000
Allowance for expected credit losses on fixed maturities, available for sale	323,000	0	$ 0	$ 0
Equity securities, cost	421,744,000	398,956,000
Credit losses associated with commercial mortgage loans	0
Allowance for credit losses on premium balances receivable	8,836,000	7,000,000
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 23,711,000	$ 18,000,000	$ 21,000,000
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	84,353	83,959
Treasury shares (in shares)	92,227	92,621

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- Definition

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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Amount of allowance for credit loss on 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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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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