Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 246,994	$ 233,166	$ 215,131
Policy acquisition costs deferred	644,650	641,616	620,120
Amortization	(633,385)	(627,788)	(602,085)
Balance, end of year	$ 258,259	$ 246,994	$ 233,166