Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax [Line Items]
Expected income tax benefit									$ 4,856	$ 1,011	$ 4,725
Tax exempt income									4,487	4,939	671
Transaction costs									(131)	3,654	0
Change in valuation allowance									(924)	43,808	(5,554)
Non-taxable foreign exchange (losses) gains									(1,126)	(1,897)	885
Withholding tax									(2,578)	(3,036)	(327)
Other									(4,924)	(2,613)	(1,008)
Income tax (expense) benefit	$ 7,700	$ 1,316	$ (6,612)	$ (2,744)	$ (8,453)	$ 4,573	$ 1,842	$ 47,904	$ (340)	$ 45,866	$ (608)
Bermuda | Domestic Country
Income Tax [Line Items]
Statutory income tax rate									0.00%
U.S. | Internal Revenue Service (IRS)
Income Tax [Line Items]
Foreign statutory income tax rate									35.00%
Ireland | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									12.50%
U.K. | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									20.00%
Singapore | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									17.00%