Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gross Amount
Premiums written and contract deposits, Gross Amount	$ 374,598	$ 342,268	$ 988,588	$ 936,948
Premiums and contract charges earned, Gross Amount	245,200	210,953	671,871	628,582
Benefits, claims and settlement expenses, Gross Amount	154,718	163,912	450,206	486,339
Ceded to Other Companies
Premiums written and contract deposits, Ceded to Other Companies	5,968	5,370	17,844	16,367
Premiums and contract charges earned, Ceded to Other Companies	8,181	5,385	22,158	16,418
Benefits, claims and settlement expenses, Ceded to Other Companies	2,310	3,207	9,399	15,551
Assumed from Other Companies
Premiums written and contract deposits, Assumed from Other Companies	2,586	1,199	7,557	3,246
Premiums and contract charges earned, Assumed from Other Companies	2,662	1,252	7,849	3,264
Benefits, claims and settlement expenses, Assumed from Other Companies	1,783	1,141	5,460	2,898
Net Amount
Premiums written and contract deposits, Net Amount	371,216	338,097	978,301	923,827
Premiums and contract charges earned, Net Amount	239,681	206,820	657,562	615,428
Benefits, claims and settlement expenses, Net Amount	$ 154,191	$ 161,846	$ 446,267	$ 473,686