Taxation (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Tax loss and credit carryforwards	$ 111,835	$ 60,395
Unearned premiums	14,430	10,108
Deferred finance charges	10,160	14,646
Reserve for claims and claim expenses	8,984	17,345
Accrued expenses	7,196	4,292
Deferred underwriting results	4,033	3,514
Premiums receivable	3,412	0
Investments	0	4,427
Deferred tax assets	160,050	114,727
Deferred tax liabilities
Deferred acquisition expenses	(16,296)	(11,801)
VOBA	(12,673)	0
Investments	(6,468)	0
Intangible assets	(2,891)	0
Amortization and depreciation	(2,133)	(2,992)
Deferred tax liabilities	(40,461)	(14,793)
Net deferred tax asset before valuation allowance	119,589	99,934
Valuation allowance	(75,685)	(35,271)
Net deferred tax asset	$ 43,904	$ 64,663