Deferred Charge Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning carrying value	$ 86,585,000	$ 80,192,000	$ 94,551,000
Recorded during the year	224,504,000	20,174,000	0
Amortization	(38,627,000)	(13,781,000)	(14,359,000)
Ending carrying value	272,462,000	$ 86,585,000	$ 80,192,000
Impairment	$ 0