Taxation (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Tax loss and credit carryforwards	$ 51,620	$ 40,512
Reserve for claims and claim expenses	26,265	29,833
Deferred interest expense	18,408	18,901
Accrued expenses	9,386	15,730
Unearned premiums	7,496	8,946
Deferred underwriting results	0	421
Deferred tax assets	113,175	114,343
Deferred Tax Liabilities
Deferred acquisition expenses	(7,485)	(10,741)
Amortization and depreciation	(3,605)	(5,899)
Deferred underwriting results	(2,964)	0
Investments	(223)	(1,479)
Deferred tax liabilities	(14,277)	(18,119)
Net deferred tax asset before valuation allowance	98,898	96,224
Valuation allowance	(18,776)	(17,852)
Net deferred tax asset	$ 80,122	$ 78,372