Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Gross Amount
Premiums written and contract deposits, Gross Amount	$ 333,731	$ 299,093
Premiums and contract charges earned, Gross Amount	243,170	213,256
Benefits, claims and settlement expenses, Gross Amount	139,532	142,052
Ceded to Other Companies
Premiums written and contract deposits, Ceded to Other Companies	6,310	5,848
Premiums and contract charges earned, Ceded to Other Companies	8,377	5,822
Benefits, claims and settlement expenses, Ceded to Other Companies	1,984	4,292
Assumed from Other Companies
Premiums written and contract deposits, Assumed from Other Companies	1,337	2,149
Premiums and contract charges earned, Assumed from Other Companies	1,472	2,351
Benefits, claims and settlement expenses, Assumed from Other Companies	1,112	1,624
Net Amount
Premiums written and contract deposits, Net Amount	328,758	295,394
Premiums and contract charges earned, Net Amount	236,265	209,785
Benefits, claims and settlement expenses, Net Amount	$ 138,660	$ 139,384