SCHEDULE V-VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for uncollectible reinsurance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for uncollectible reinsurance
Balance at beginning of period	$ 25,911	$ 25,911	$ 25,911
Amounts charged to expense	(647)
Amounts recovered (written off)	(198)
Balance at end of period	$ 25,066	$ 25,911	$ 25,911