CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fixed maturities, available-for-sale, amortized cost	$ 757,835	$ 1,163,923
Equity securities, cost	1,000
Reinsurance balance receivable, net	19,788	5,777
Deferred commission and other acquisition expenses	40,242	51,903
Funds withheld receivable	642,070	654,805
Reserve for loss and loss adjustment expenses	1,567,526	1,893,299
Unearned premiums	110,071	144,271
Accrued expenses and other liabilities	$ 72,424	$ 53,002
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, shares issued (in shares)	92,278,828	89,815,175
Common shares, shares outstanding (in shares)	86,443,757	84,801,161
Treasury shares (in shares)	5,835,071	5,014,014
Affiliated Entity
Reinsurance balance receivable, net	$ 17,794
Deferred commission and other acquisition expenses	37,354	$ 45,732
Funds withheld receivable	603,734	603,093
Reserve for loss and loss adjustment expenses	1,431,177	1,727,193
Unearned premiums	100,273	122,737
Accrued expenses and other liabilities	$ 52,503	$ 35,719