Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gross Amount
Premiums written and contract deposits, Gross Amount	$ 332,379	$ 314,897	$ 666,110	$ 613,990
Premiums and contract charges earned, Gross Amount	230,635	213,415	473,805	426,671
Benefits, claims and settlement expenses, Gross Amount	143,285	153,436	282,817	295,488
Ceded to Other Companies
Premiums written and contract deposits, Ceded to Other Companies	6,379	6,028	12,689	11,876
Premiums and contract charges earned, Ceded to Other Companies	8,307	8,155	16,684	13,977
Benefits, claims and settlement expenses, Ceded to Other Companies	2,407	2,797	4,391	7,089
Assumed from Other Companies
Premiums written and contract deposits, Assumed from Other Companies	3,169	2,822	4,506	4,971
Premiums and contract charges earned, Assumed from Other Companies	3,103	2,836	4,575	5,187
Benefits, claims and settlement expenses, Assumed from Other Companies	2,132	2,053	3,244	3,677
Net Amount
Premiums written and contract deposits, Net Amount	329,169	311,691	657,927	607,085
Premiums and contract charges earned, Net Amount	225,431	208,096	461,696	417,881
Benefits, claims and settlement expenses, Net Amount	$ 143,010	$ 152,692	$ 281,670	$ 292,076