Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gross Amount
Premiums written and contract deposits, Gross Amount	$ 314,897	$ 305,864	$ 613,990	$ 594,680
Premiums and contract charges earned, Gross Amount	213,415	209,892	426,671	417,629
Benefits, claims and settlement expenses, Gross Amount	153,436	170,459	295,488	322,427
Ceded to Other Companies
Premiums written and contract deposits, Ceded to Other Companies	6,028	5,483	11,876	10,997
Premiums and contract charges earned, Ceded to Other Companies	8,155	5,505	13,977	11,033
Benefits, claims and settlement expenses, Ceded to Other Companies	2,797	3,330	7,089	12,344
Assumed from Other Companies
Premiums written and contract deposits, Assumed from Other Companies	2,822	1,341	4,971	2,047
Premiums and contract charges earned, Assumed from Other Companies	2,836	1,223	5,187	2,012
Benefits, claims and settlement expenses, Assumed from Other Companies	2,053	1,149	3,677	1,757
Net Amount
Premiums written and contract deposits, Net Amount	311,691	301,722	607,085	585,730
Premiums and contract charges earned, Net Amount	208,096	205,610	417,881	408,608
Benefits, claims and settlement expenses, Net Amount	$ 152,692	$ 168,278	$ 292,076	$ 311,840