Consolidated Statements of Comprehensive Income (Loss) - 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
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 3,771	$ (707)	$ 1,535	$ 2,748	$ (24,567)	$ (12,325)	$ 2,487	$ 330	$ 7,347	$ (34,075)	$ 18,323
Other comprehensive income (loss), net of tax:
Unrealized net gains (losses) on fixed income securities									16,071	(6,868)	12,649
Foreign currency translation adjustments									645	(830)	522
Other comprehensive income (loss)									16,716	(7,698)	13,171
Comprehensive income (loss)									$ 24,063	$ (41,773)	$ 31,494