Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Life insurance in force, gross	$ 725,293				$ 855,366				$ 725,293	$ 855,366	$ 979,291
Life insurance in force, ceded	(65,795)				(84,603)				(65,795)	(84,603)	(100,189)
Life insurance in force, assumed	0				0				0	0	0
Life insurance in force, net	$ 659,498				$ 770,763				$ 659,498	$ 770,763	$ 879,102
Life insurance in force, percentage of amount assumed to net	0.00%				0.00%				0.00%	0.00%	0.00%
Premiums earned, gross									$ 1,148,251	$ 989,529	$ 905,126
Ceded, premiums earned									(267,197)	(330,136)	(434,166)
Premiums earned, assumed									273,807	236,182	142,161
Net, premiums earned	$ 272,686	$ 270,325	$ 276,563	$ 335,287	$ 231,947	$ 264,597	$ 228,812	$ 170,219	1,154,861	895,575	613,121
Property and casualty
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Premiums earned, gross									1,146,956	985,637	899,226
Ceded, premiums earned									(267,174)	(330,110)	(433,075)
Premiums earned, assumed									273,807	236,182	142,161
Net, premiums earned									$ 1,153,589	$ 891,709	$ 608,312
Premiums earned, percentage of amount assumed to net									23.70%	26.50%	23.40%
Life and annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Premiums earned, gross									$ 1,295	$ 3,892	$ 5,900
Ceded, premiums earned									(23)	(26)	(1,091)
Premiums earned, assumed									0	0	0
Net, premiums earned									$ 1,272	$ 3,866	$ 4,809
Premiums earned, percentage of amount assumed to net									0.00%	0.00%	0.00%