Insurance Operations - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 93,613	$ 60,759
Acquisition costs deferred	189,970	204,283
Acquisition costs expensed	(184,771)	(171,429)	$ (126,023)
Ending balance	$ 98,812	$ 93,613	$ 60,759