Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gross Amount
Premiums written and contract deposits, Gross Amount	$ 368,577	$ 374,598	$ 1,034,687	$ 988,588
Premiums and contract charges earned, Gross Amount	237,193	245,200	710,998	671,871
Benefits, claims and settlement expenses, Gross Amount	59,401	154,718	342,218	450,206
Ceded to Other Companies
Premiums written and contract deposits, Ceded to Other Companies	2,146	5,968	14,835	17,844
Premiums and contract charges earned, Ceded to Other Companies	4,261	8,181	20,945	22,158
Benefits, claims and settlement expenses, Ceded to Other Companies	(90,161)	2,310	(85,770)	9,399
Assumed from Other Companies
Premiums written and contract deposits, Assumed from Other Companies	2,422	2,586	6,928	7,557
Premiums and contract charges earned, Assumed from Other Companies	2,421	2,662	6,996	7,849
Benefits, claims and settlement expenses, Assumed from Other Companies	1,863	1,783	5,107	5,460
Net Amount
Premiums written and contract deposits, Net Amount	368,853	371,216	1,026,780	978,301
Premiums and contract charges earned, Net Amount	235,353	239,681	697,049	657,562
Benefits, claims and settlement expenses, Net Amount	$ 151,425	$ 154,191	$ 433,095	$ 446,267